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<pre>
   4th Workshop on Flexible Model-driven Engineering
                   (FlexMDE 2018)

              Davide Di Ruscio1 , Juan de Lara2 , and Alfonso Pierantonio1
                              1
                                DISIM, University of L’Aquila, Italy
                          2
                              Universidad Autónoma de Madrid (Spain)

     Over the last years, numerous modelling platforms have been developed to simplify
and automate many steps of Model Driven Engineering (MDE) processes. However,
still several challenges have to be solved for enabling a wider adoption of MDE. One
of the most important impediments in adopting MDE tools is related to the reduced
flexibility of existing modelling platforms that do not permit to relax or enforce their
rigidity depending on the stages of the applied development process. For instance, EMF
does not permit to enter models which are not conforming to a metamodel. On one hand
this allows only valid models to be defined, but on the other, it makes the corresponding
pragmatics more difficult. Thus, there is an increasing need for techniques supporting
flexibility in a wide range of modelling activities, including metamodel, model, and
model transformation development and reuse.
     In order to tackle these challenges, the FlexMDE series of workshops started in
2012 under the name of XM (“eXtreme Modelling”). XM was held for three editions,
which in 2015 continued under the name of FlexMDE. All editions have been held
as satellite events of the MoDELS conference. More information about the workshop
series can be found at http://www.di.univaq.it/flexmde/. Along these 7
years, we have published special issues associated with the workshop on the Journal
of Object Technology [2] and the Computer Languages Systems & Structures Journal
(Elsevier) [1].
     The primary goal of the workshop is to identify the difficulties in the current practice
of MDE related to the lack of flexibility. FlexMDE encourages contributions of ideas,
concepts, tools and techniques also from other areas of software development which
could be useful to revise certain MDE fundamental typing concepts, and to define agile
model sketching techniques.
     In the 4th edition, FlexMDE initially received 5 submissions, 4 of which materi-
alized into papers. The committee accepted all 4 papers, and the program included an
invited talk by Prof. Thomas Kühne from the Victoria University of Wellington (New
Zealand).


References
1. D. D. Ruscio, J. de Lara, and A. Pierantonio. Special issue on flexible model driven engineer-
   ing. Computer Languages, Systems & Structures, 49:174–175, 2017.
2. D. D. Ruscio, A. Pierantonio, and J. de Lara. Extreme modelling (XM) 2012 special section.
   Journal of Object Technology, 13(3), 2014.

</pre>