=Paper= {{Paper |id=Vol-3691/paper32 |storemode=property |title=Systematic Review: State of Knowledge on Learning Difficulties and Teaching Strategies in Linear Algebra |pdfUrl=https://ceur-ws.org/Vol-3691/paper32.pdf |volume=Vol-3691 |authors=Alethia Piñón Jiménez,Diana Margarita Córdova Esparza |dblpUrl=https://dblp.org/rec/conf/cisetc/JimenezE23 }} ==Systematic Review: State of Knowledge on Learning Difficulties and Teaching Strategies in Linear Algebra== https://ceur-ws.org/Vol-3691/paper32.pdf
                         Systematic Review: State of Knowledge on Learning
                         Difficulties and Teaching Strategies in Linear Algebra
                         Alethia Piñón Jiménez1 and Diana Margarita Córdova Esparza2

                         1 Facultad de Informática, Universidad Autónoma de Querétaro, Av. de las Ciencias S/N, Juriquilla, Querétaro 76230,
                         México
                         2 Facultad de Informática, Universidad Autónoma de Querétaro, Av. de las Ciencias S/N, Juriquilla, Querétaro 76230,
                         México

                                                                Abstract
                                                                This paper presents a systematic review focusing on diagnosing learning difficulties and implementing
                                                                didactic strategies in linear algebra. We aim to deepen the understanding of this topic over the past
                                                                decade. Our research, guided by four questions, analyzed 78 articles, ultimately including 37 in this
                                                                review. We based our search strategy on the PRISM protocol and used specific indicators. Our findings
                                                                indicate that most authors in this review primarily use the APOE theory and genetic decomposition for
                                                                formal diagnosis of learning problems. This approach helps build knowledge frameworks, especially in
                                                                vector spaces and linear transformations. A key finding is the prevalent use of digital technology in both
                                                                the models and strategies proposed in these studies. This review highlights opportunities for future
                                                                research in diagnosing learning problems and developing innovative, technology-integrated strategies
                                                                in education.


                                                                Keywords
                                                                Education, didactic strategy, linear algebra 1



                         1. Introduction
                         In the field of education, teaching and learning mathematics often presents significant challenges
                         for teachers. These challenges include covering the subject's content within the allotted time and
                         addressing the diverse learning difficulties that students face. Additionally, teachers must
                         develop effective teaching strategies to enhance learning outcomes in mathematics.
                             Each researcher in this field brings their unique perspective, knowledge, and experience to
                         analyze the state of knowledge on teaching and learning mathematics. Despite these efforts,
                         learning problems in linear algebra, especially in abstract topics like vector spaces and linear
                         transformations, persist (31).
                             This paper aims to conduct a systematic review to better understand how learning difficulties
                         in linear algebra are formally diagnosed and what teaching strategies are being implemented. The
                         importance of this review becomes evident when considering that linear algebra is a fundamental
                         subject in science and engineering courses. It contributes significantly to developing students'
                         logical, heuristic, and algorithmic thinking skills by using linear models to predict and control
                         system behaviors.
                             Therefore, this review will analyze current knowledge on diagnosing student learning
                         problems in linear algebra and the recent implementation of didactic strategies to improve
                         teaching and learning in this field.



                         CISETC 2023: International Congress on Education and Technology in Sciences, December 04–06, 2023, Zacatecas,
                         Mexico
                            alethia463@gmail.com (A. Piñón-Jiménez); diana.cordova@uaq.mx (D. M. Córdova-Esparza)
                            0000-0003-0326-4741 (A. Piñón-Jiménez); 0000-0002-5657-7752 (D. M. Córdova-Esparza)
                                                           © 2023 Copyright for this paper by its authors.
                                                           Use permitted under Creative Commons License Attribution 4.0 International (CC BY 4.0).
                                                           CEUR Workshop Proceedings (CEUR-WS.org)
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Workshop      ISSN 1613-0073
Proceedings
2. Method
Our search strategy used the PRISM (Preferred Reporting Items for Systematic Reviews and
Meta-Analyses) protocol as a reference and followed specific indicators. We guided our research
with four key questions:

   1. What are the main factors influencing learning problems in linear algebra?
   2. Which learning theories have been applied to formally diagnose these learning problems
and design teaching strategies for linear algebra?
   3. What are the developed thematic strategies for linear algebra, and do they share any
common characteristics?
   4. What were the sizes of the groups used to validate the formal diagnoses or as pilot groups
for implementing teaching strategies?

   To address our research questions and achieve the study's objective, we conducted a
systematic literature review. This method is known for systematically integrating empirical
results related to a specific research problem (34). We developed our research methodology in
four distinct stages, which we detail in the subsequent paragraphs.

   Stage 1: Setting Inclusion and Exclusion Criteria for Research Studies
   In this first stage, we established specific criteria for including and excluding studies in our
research. For inclusion, we focused on research articles, excluding other document types like
theses and book chapters. We considered articles published from 2013 to 2022, ensuring the
research was no more than 10 years old. Additionally, we included studies written in Spanish,
English, or Portuguese. The final inclusion criterion was that the articles must be related to
teaching or learning linear algebra; we excluded articles on topics outside this specific
educational area.
    For exclusion, we omitted any articles that did not meet all our inclusion criteria. This also
included articles that were duplicates in our study.
   Stage 2: Developing the Search Strategy
   In this stage, we executed our search strategy across various databases, yielding 71 articles for
analysis. Our search criteria varied depending on the database to maximize results (see Figure 1).
We selected databases that showed the highest number of relevant results for our topic. The
databases and their respective search formulas were:

   1. ERIC: Using the formula (“Education”) AND (“Linear Algebra”), we obtained 9 articles.
   2. Scielo and DOAJ: We used (“Education”) AND (“Linear Algebra”) and (“Education”) AND
(“Linear Algebra”), obtaining 8 and 30 articles, respectively.
   3. Redalyc: With the formula (“Education”) AND (“Linear Algebra”), we found 8 articles.
   4. Science Direct: We used (Teaching OR Learning) AND (“Linear Algebra”), leading to 9
articles.
   5. Dialnet: The formulas (Teaching OR Learning) AND (“Linear Algebra”) and (Didactics) AND
(“Linear Algebra”) resulted in 7 articles.

   Additionally, we identified 49 articles through references. After applying our exclusion
criteria, 7 of these were ultimately included in our study.
Figure 1: Overview of the Information Search and Data Collection Process. This flowchart details
the search terms used across various databases, the number of articles retrieved from each, and
the filtering process leading to the final selection of articles included in the review. It also outlines
the exclusion criteria applied and the total number of articles analyzed.

   Stage 3: Information Purification
   In this stage, we conducted an initial review of the 78 articles gathered from the databases and
references mentioned earlier. The purpose of this review was to assess each article's relevance
to our research objectives. We rejected 34 articles during this process because they did not
provide relevant data for our systematic review analysis or contribute to answering our research
questions. Consequently, 37 articles were selected and included in our review.

   Stage 4: Data Coding and Analysis
   In this final stage, we analyzed the data based on specific categories. This structured approach
helped us to thoroughly examine and understand the findings. The categories we focused on
were:
   1. Factors influencing learning problems in linear algebra.
   2. Learning theories applied for diagnosing learning problems or implementing teaching
strategies in linear algebra.
   3. Thematic contents within the subject of linear algebra that were the focus of the research.
   4. Strategies implemented in teaching linear algebra.
   5. Sizes of the samples used for validation or implementation in pilot tests.

   This categorization facilitated a comprehensive analysis of the collected data, aligning it
closely with our research objectives.

3. RESULTS
Factors Influencing Linear Algebra Learning Problems
   The factors identified as influencing learning problems in linear algebra are varied, as
observed in the systematic review of the research. Despite this diversity, there is a notable
consistency in the findings. This is apparent when we see that several factors recur across
multiple studies. In some instances, more than one factor is repeated between different
investigations, as detailed in Table 1. This repetition underscores the commonalities in challenges
faced by learners in linear algebra.
Table 1
Influential Factors in Linear Algebra Learning Problems Identified in Scholarly Research
This table compiles pivotal studies on linear algebra, listing the year of publication, authors, article
title, and the predominant factor influencing learning difficulties as identified in each piece of
research.
     Year of         Authors                    Title article               Predominant Factor
   publication
                                         Increasing Reality and
                  Nishizawa et
      2013                         Educational Merits of a Virtual                  Abstract
                         al.
                                                    Game
      2013          Parraguez         The role of the body in the                   Abstract
                                    construction of the concept of
                                               Vector Space
      2013           Rosso &            A taxonomy of errors in               Abstract, Language,
                      Barros             learning vector spaces           Various representations
                                    University students’ solution
                                                                                 Abstract, Prior
      2014         Birinci et al.   processes in systems of linear
                                                                           knowledge, Axiomatic
                                                 equation
                                        Coordination of semiotic
                     Ramírez-
                                    representation records in the
      2014         Sandoval et                                              Various representations
                                    use of linear transformations
                         al.
                                               in the plane
                                        A teaching experience of                    Abstract
                    Salgado &
                                           values, vectors and
      2014          Trigueros
                                     eigenspaces based on APOE
                     Gaisman
                                                   theory
                                       Constructions and mental                     Abstract
                    Trigueros
                                     mechanisms for learning the
      2015         Gaisman et
                                      matrix theorem associated
                         al.
                                      with linear transformation
                    Berman &        Definitions are important: the
      2016                                                                       Formalism
                   Shvartsman             case of linear algebra
                                        Advanced mathematical
                     Marins &        thinking manifested in tasks
      2016                                                                  Formalism, Abstract
                      Pereira                involving linear
                                             transformations
                                     A Teaching Proposal for the
                                                                              Abstract, Formalism
      2017        Beltrán et al.       Study of Eigenvectors and
                                               Eigenvalues.
      2017            Costa &       Teaching linear algebra in an
                                                                              Abstract, Without
                    Rossignoli             engineering school:
                                                                           connection with other
                                     Methodological and didactic
                                                                             subjects, Language
                                                  aspects
                                      From Practical to Theorical
      2018             Pierri        Thinking: The Impact of the            Abstract, Formalism
                                            Role-Play Activity.
      2019           Álvarez-         Teaching Linear Algebra in                Epistemological
                     Macea &            engineering courses: an             component, didactic
                       Costa           analysis of the process of            schemes, Language
                                   mathematical modeling within
                                          the framework of the
                                       Anthropological theory of
                                                 didactics
                                      Teaching Linear Algebra            Abstract, procedures
                  Aytekin &
     2019                              Supported by GeoGebra            memorization, lack of
                   Kiymaz
                                     Visualization Environment              vinculation
     2019         Gallo et al.         Interpretation of linear
                                                                         Formalism, Language,
                                   transformations in the plane
                                                                       Various representations
                                            using GeoGebra
                                       Linear algebra learning
                   García-
     2019                         focused on plausible reasoning               Formalism
                 Hurtado et al.
                                      in engineering programs
                                  Teaching-Learning of Matrices           Abstract, Formalism,
     2019         Xavier et al.
                                  in the civil Engineering Course         Prior knowledge
                                   Construction of the meanings
                                     of vector space operations           Abstract, Formalism
     2020         Parraguez
                                            through linearly
                                   independent/dependent sets
                                       A Didactic Sequence for
                                            Teaching Linear
                                  Transformation: Unification of           Concept application
     2020           Pizarro
                                       Methods and Problems,                 conditions
                                   Modeling and Explanation of
                                                Learning
     2021         Cárcamo et            Hypothetical learning                   Abstract
                      al.           trajectories: an example in a
                                         linear algebra course
     2021         Kariadinata     Students Reflective Abstraction               Abstract
                                      Ability on Linear Algebra
                                         Problem Solving and
                                  Relationship with Prerequisite
                                               Knowledge.
     2021         Silva et al.      Creation and uses of LineAlg               Formalism
                                  application as a learning object
                                           in basic education
     2021       Wibawa et al.           Learning Effectiveness                Abstract,
                                   Through Video Presentations         Demonstrations, Large
                                  and WhatsApp Group (WAG) in          number of operations
                                   the Pandemic Time Covid-19            between variables

    In our systematic review, we found that the most significant factor affecting linear algebra
learning, as identified by various authors, is the subject's level of abstraction and formalism (see
Figure 2). The high level of abstraction required by linear algebra itself poses a challenge for
students, demanding a substantial degree of abstract thinking for proper understanding (37). As
for formalism, it stems from the way linear algebra is presented, studied, and learned in the
literature, which heavily relies on the formalism of mathematical language (25).
    Other key aspects impacting linear algebra learning difficulties include students' challenges in
differentiating between a concept and its various representations (29) and the use of diverse
languages when discussing vector spaces and linear transformations (8). Additionally, the
connection to the teacher's training emerges as a notable factor. If a teacher has a background in
mathematics or a related field, the issue often lies in not having the foundational structures in
place. Conversely, for engineering educators, the challenge is often linking the relevance and
applicability of linear algebra concepts to their specific field (28).
                         Incident factors in learning Linear Algebra
           18
           16
           14
           12
           10
            8
            6
            4
            2
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Figure 2: Prevalence of Factors Impacting Learning in Linear Algebra
This bar chart illustrates the frequency of various factors that influence the learning of linear
algebra, as identified in the reviewed research, including abstraction, formalism, language, and
others.

   Learning Theories Applied in Linear Algebra
   This section highlights the learning theories applied in diagnosing learning difficulties and
implementing didactic strategies in linear algebra. It also covers the tools used in the various
research projects analyzed. Additionally, we provide information about the countries where each
study was conducted, as detailed in Table 2.

Table 2
Learning Theories and Research Tools Utilized in Linear Algebra Studies.
This table enumerates the studies included in the systematic review, outlining the applied learning
theories, the research tools used, and the countries where the studies were conducted.
   Autor y Año        País            Applied learning theory                  Tool used
  (Parraguez,
                       Chile                    APOE                 Semi-structured interview
     2013)
    (Rosso &
                                           Theory of didactic
     Barros,         Argentina                                           Problems situations
                                   situations and constructivism
     2013)
  (Parraguez
                                                                          Questionnaire and
  & Uzuriaga,          Chile                    APOE
                                                                              interviews
     2014)
   (Ramírez-
                                           Theory of semiotic        Interview with sequence of
  Sandoval et         México
                                           represetations                     5 activities
   al., 2014)
  (Salgado &
   Trigueros                                                           Questionary and semi-
                      México                    APOE
    Gaisman,                                                             structured interview
     2014)
  (Trigueros
                       Chile                    APOE                   Questionary and semi-
  Gaisman et
                                                                         structured interview
   al., 2015)
  (Murillo &
    Beltrán,          Spain                     APOE                     RGB color system
     2016)
 (González &                                                         Internalization of concrete
                    Colombia                    APOE
  Roa, 2017)                                                                   actions
      (Roa-
   Fuentes &       Chile and
                                                APOE                        Questionary
  Parraguez,      Colombia
     2017)
     (Costa,        Argentina        Anthropological Theory of
                                                                    Study and research activity
     2018)                                the Didactic
    (Karrer,                            Theory of semiotic
                      Brazil                                              Using GeoGebra
     2018)                               represetations
  (Rodríguez                                                             Questionnaire and
                      Chile                     APOE
 et al., 2018)                                                              interviews
   (Álvarez-
                                     Anthropological Theory of
    Macea &         Colombia                                        Study and research activity
                                          the Didactic
 Costa, 2019)
 (Gallo et al.,                          Theory of semiotic         Series of computer activities
                   Argentina
   2019)                                 represetations              using GeoGebra software
 (Parraguez,
                      Chile                     APOE                   Written questionnaire
     2020)
  (Fortuny &                                                          Guía escrita, archivos de
                                       Realistic mathematics
 Fuentealba,          Spain                                          audio y video, entrevistas
                                           education
     2021)                                                           con algunos estudiantes.
 (Betancur et                                                           Questionary and semi-
                  Colombia                    APOE
   al., 2022)                                                          structured interview

   In the systematic review, the APOE theory emerges as the most frequently applied learning
theory in the research works analyzed (see Figure 3). This theory has been predominantly used
to diagnose learning problems in linear algebra more accurately and deeply. It employs genetic
decomposition to develop mental schemes or structures that aid students in constructing
knowledge about specific concepts (30).
   Regarding the theory of semiotic representations, the reviewed studies have utilized it to
support didactic strategies. These strategies involve varying representations of concepts, often
enhanced by computational tools for better graphic representation (16). The anthropological
theory of didacticism was applied to identify students' learning difficulties in linear algebra and
to back didactic strategies using modeling, incorporating technology such as mobile devices and
software (7).
    The theory of didactic situations was employed to categorize common errors in learning the
topic of vector spaces (32). Additionally, the column labeled "others" in Figure 3 includes various
theories like the theory of didactic proposal situations and realistic mathematical education (10).
These theories have been instrumental in supporting didactic proposals for teaching linear
algebra.
                                       Learning theories
     12

     10

      8

      6

      4

      2

      0
                 APOE         Semiotic representations   Anthropology of the    Others
                                                              didactic

Figure 3: Distribution of Learning Theories in Reviewed Research. This figure illustrates the
prevalence of different learning theories as applied in the research works reviewed. The APOE
theory leads in application, followed by semiotic representations, the anthropological theory of
the didactic, and other various theories.

   In the systematic review, we noted the tools employed for conducting research. Prominent
among these are questionnaires and interviews, particularly in studies implementing the APOE
theory. The GeoGebra software stands out, along with the use of study guides on virtual platforms
and a variety of activities grounded in learning theories.
    It is also worth noting the global reach of research in the field of linear algebra education.
Chile emerges as a leader in research production within Latin America. However, countries
outside the American continent, such as Spain, Turkey, and Indonesia, also contribute
significantly. This underscores the universal relevance of the challenges in teaching and learning
linear algebra, indicating that these difficulties are common in classrooms worldwide,
irrespective of location.
    Regarding teaching strategies for linear algebra, the review also examined the specific subject
topics that have been the focus of research and the sample sizes used in these studies (refer to
Table 3).

Table 3
Overview of Teaching Models or Strategies, Topics, and Sample Sizes in Linear Algebra Research.
This table details the teaching models or strategies applied to linear algebra topics, specifying the
topics addressed and the sample sizes involved in each study.
   Author and
                     Model or
      year of                                  Topics                          Sample size
                      strategy
   publication
 (Nishizawa et         Digital               Vectors in 3D                      40 students
   al., 2013)       technology
  (Yildiz Ulus,        Digital            Eigenvectors and
                                                                           Not implementation
      2013)         technology              eigenvalues
  (Salgado &
   Trigueros       APOE-based                                             34 students on average
                                   Eigenvectors and eigenvalues
   Gaisman,          activities                                              per semester
      2014)
                                     Matrices and determinants,
   (Petrov et          Digital
                                   Vector spaces, Eigenvectors                 37 students
   al., 2015)      technology
                                         and eigenvalues
   (Gabriel                         Systems of linear equations,
                     Digital                                           35 teachers and 5
 Vergara et                        Matrices, Eigenvectors and
                   technology                                             students
  al., 2016)                              eigenvalues
 (Murillo &
                      Digital
   Beltrán,                                 Vector spaces             Not implementation
                   technology.
    2016)
                                     Systems of linear equations,
(Torres et al.,      Digital      Vector spaces, Matrices, Linear
                                                                      Not implementation
    2016)          technology     transformations, Eigenvectors
                                         and eigenvalues
    (Costa
                     Digital
&Rossignoli,                                Not specified           Voluntaries 295 students
                   technology
    2017)
 (Meneu et                                Eigenvectors and
                    Activities                                        Not implementation
  al., 2017)                               eigenvalues
                     Digital
(Costa, 2018)                        Linear algebra with physics          50 students
                   technology
   (Karrer,          Digital
                                       Linear transformations              2 students
    2018)          technology
 (Kartika et         Digital
                                             Vectors 3D                   69 students
  al., 2018)       technology
                     Digital        Systems of linear equations,
(Pierri, 2018)                                                            70 students
                   technology        Matrices, Vector spaces
  (Aytekin &
                     Digital
    Kiymaz,                                 Vector spaces                  4 students
                   technology
     2019)
 (Gallo et al.,      Digital
                                       Linear transformations         Not implementation
     2019)         technology
    (García-                        System of linear equations,
                  Mathematical                                            36 students
  Hurtado et                       Matrices and determinants,
                   modeling
   al., 2019)                        Vectors, Vector spaces
(Villalobos &        Digital             Vector operations                40 students
  Ríos, 2019)      technology
(Xavier et al.,
                    Activities                Matrices                Not implementation
     2019)
                    Problem-                                          21 students and 21
(Nissa et al.,                      Systems of linear equations,
                       based                                           control group
   2020)                                   Matrices
                     learning
                     Didactic
                  engineering
  (Pizarro,                                                               17 students
                        and            Linear transformations
   2020)
                  Mathematical
                    modeling
(Fortuny &        Hypothetical
                                                                           7 students
Fuentealba,          learning               Vector spaces
    2021)          trajectories
(Silva et al.,        Digital        Matrices, systems of linear
                                                                      Not implementation
    2021)          technology              equations
(Wibawa et            Digital
                                            Vector spaces                 14 students
 al., 2021)        technology
   This review reveals a strong emphasis on the use of digital technology in teaching the topics
discussed, with the specific tools and elements varying according to the research aims (Figure 4).
For instance, there is a focus on utilizing various mathematical software (35), knowledge
management platforms (26), web-based learning tools (17), virtual games (21), and virtual
evidence portfolios (36).
    The systematic and thorough diagnosis of mental structures that underpin the understanding
of vector space concepts, linked to the design of proposed activities, was distinctly noted in the
study by (33). However, a common thread across many studies is that topics of higher complexity
and abstraction are most frequently addressed, both in diagnostic processes and in
methodological proposals for teaching and learning.
    Notably, studies targeting instruction within the domain of engineering, particularly
mathematical modeling, are prominent (13). This aligns with the practical application
requirements characteristic of engineering curriculums.



                                     Teaching Model or Strategy
           14

           12

           10

            8

            6

            4

            2

            0
                Digital technology     Mathematical     Activities        Others
                                        modeling

Figure 4: Frequency of Different Teaching Models or Strategies Used
This bar graph illustrates the frequency with which various teaching models or strategies are
applied in linear algebra education, showcasing a predominant use of digital technology, followed
by mathematical modeling, diverse learning activities, and other strategies.

Research Focus on Linear Algebra Topics
The systematic review of research works revealed that most teaching strategies and diagnostic
efforts in linear algebra are focused on the more abstract concepts. Vector spaces (24), linear
transformations (30), and matrices are the topics most frequently addressed. Less commonly, but
still noteworthy, are studies on systems of linear equations (6) and eigenvalues and eigenvectors
(3). These findings align with the goal of the research: to develop tools that mitigate the factors
impacting the teaching and learning of complex linear algebra topics (4).

4. Discussion and Conclusions from the Systematic Review
   The systematic review has led to several important conclusions regarding the factors that
hinder students' learning of linear algebra. High levels of abstraction (23), unfamiliar formalism
(18), language barriers (1), multiple representations of mathematical objects (12), lack of prior
knowledge (40), and weak connections in learning (18) are significant challenges. Additionally,
the complexity of new definitions, the quantity of operations between variables, and the subject's
epistemological and axiomatic characteristics are noted as less frequent but still impactful
factors.
    In terms of learning theories, the review underscores the APOE theory as the predominant
framework for in-depth research on learning difficulties in linear algebra. The theory's popularity
suggests it effectively uncovers and addresses students' mental structures during knowledge
construction, as highlighted by Rodriguez et al. (31). Despite this, the APOE theory's main
application is in diagnosis, with other theories more commonly used to explore the results of
various teaching and learning strategies, except in the work of Salgado and Trigueros (33). This
review reveals a gap: the direct link between systematic diagnosis and strategy application is
often absent. This could be due to educational institutions' urgent need to produce quick results,
relying on authors' experience and conceptual understanding to design their approaches.
    Digital technology's role is consistently significant in the research on teaching and learning
strategies. Mathematical software applications (16), (20), (41), web-based learning tools—
especially relevant during the COVID-19 pandemic for remote education (39), and virtual games
(38) are some examples that reflect the growing, irreversible trend of digital integration in
education. The main research focus in terms of content includes vector spaces (15) and linear
transformations (14), likely due to their complex and abstract nature requiring a deep
understanding.
    Regarding sample sizes for statistical analysis in the reviewed studies, they ranged from 2 to
295 participants, with variations in application time and students' nationalities. This indicates a
need for further research with larger populations, leveraging digital technology for more
extensive validation and evaluation. The reviewed research, regardless of its focus, often bases
some methodological aspects on the authors' experiences, their conceptual understanding, and
sometimes the influence of a research community. The effectiveness of proposed solutions is
most significantly validated by the experiences of those who implement them.
    Therefore, future research should aim to enhance the authors' experiences and perspectives
by developing methodologies that better connect with research communities and employing
digital technology. This approach could allow a broader student population to engage with and
benefit from the proposed methodologies in this review.

Acknowledgements
We would like to express our sincere gratitude to CONAHCYT for providing the scholarship that
supported the graduate studies enabling this research. Their generous assistance was invaluable
to the completion of this project.

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