This volume contains the papers presented at CMDM 2017: The Second Workshop on Computer Modelling in Decision Making held on November 9{10, 2017 in Saratov. The CMDM 2017 workshop brought together researchers, postgraduate students and academics interested in computer and mathematical modelling in decision making in di erent areas. The CMDM 2017 workshop's main topic was computer and mathematical modelling in decision making in nance, insurance, banking, economic forecasting, investment and nancial analysis. The workshop took place in Saratov State University (Saratov, Russia) on the 9th and 10th of November 2017 and was co-organized with the Central Bank of the Russian Federation and the Department of Statistics and Data Analysis of Higher School of Economics (Moscow, Russia). The workshop was co-located with the VI International Youth Research and Practice Conference on Mathematical and Computer Modelling in Economics, Insurance and Risk Management, Saratov, Russia, November 9{10, 2017. Thirty one papers were submitted and twenty papers were accepted for presentation at the workshop after a careful peer reviewing process with discussions among reviewers and members of the program committee. Each paper was reviewed by at least two reviewers or members of the program committee. We would like to thank all reviewers for their helpful e orts. The EasyChair system was used to manage the submissions, reviewing, and proceedings production and we would like to express our gratitude to the sta of EasyChair system for support.