Profile

-Associate Professor at the School of Information Technology at York University.
-Head of the Enterprise Systems Group, and member of the Software Engineering Group at York University.
-PhD./MSc., Department of Computer Science, University of Toronto.
-Diploma of Engineering, School of Electrical and Computer Engineering, National Technical University of Athens (NTUA).

Current research interests:

• Empirical Methods in Conceptual Modeling.
• Goal Modeling and Analysis.
• Blockchain and Cryptocurrency Modeling, Simulation and Analysis.

For more information and current opportunities please visit the pages of the Enterprise Systems Group or contact me at the above address.

Selected Publications

Sotirios Liaskos, John Mylopoulos, Alex Borgida, Shakil M. Khan. Modeling and Reasoning about Explanation Requirements using Goal Models. In Proceedings of the 43rd International Conference on Conceptual Modeling (ER 2024). Pittsburgh, PA, USA. 2024. (long version pdf) (bibtex)

Sotirios Liaskos, Shakil M. Khan, John Mylopoulos, Reza Golipour. Model-Driven Design and Generation of Training Simulators for Reinforcement Learning. In Proceedings of the 43rd International Conference on Conceptual Modeling (ER 2024). Pittsburgh, PA, USA. 2024. (pdf) (bibtex)

Sotirios Liaskos, Ibrahim Jaouhar, Syed Muhammad Danish, Shakil M. Khan. Generating Secure Workflow Designs from Requirements Goal Models Using Patterns. In Proceedings of the 43rd International Conference on Conceptual Modeling (ER 2024). Pittsburgh, PA, USA. 2024. (pdf) (bibtex)

Sotirios Liaskos, Saba Zarbaf, John Mylopoulos, Shakil M. Khan. Empirically evaluating modeling language ontologies: the Peira framework. Software and Systems Modeling 23(4).pp. 1025 - 1052. Springer, 2024. (pdf) (Replication data) (bibtex)

Sotirios Liaskos. On the intuitive comprehensibility of contribution links in goal models: an experimental study. Empirical Software Engineering 19(1).Springer, 2023. (pdf) (Replication data) (bibtex)

Sotirios Liaskos, Shakil M. Khan, Reza Golipour, John Mylopoulos. Towards Goal-based Generation of Reinforcement Learning Domain Simulations. The 15th International i* Workshop. 2022. (pdf) (video) (bibtex)

Sotirios Liaskos, Shakil M. Khan, John Mylopoulos. Modeling and reasoning about uncertainty in goal models: a decision-theoretic approach. Software and Systems Modeling. Springer, 2022. (pdf) (R Markdown and data) (bibtex)

Sotirios Liaskos, John Mylopoulos, Shakil M. Khan. Empirically Evaluating the Semantic Qualities of Language Vocabularies. In Proceedings of the 40th International Conference on Conceptual Modeling (ER 2021) Virtual Event. pp 330-344. 2021. (pdf) (video) (slides) (R Markdown and data) (bibtex)

Olesya Zaremba, Sotirios Liaskos. Towards a typology of questions for requirements elicitation interviews. In Proceedings of the 29th IEEE International Requirements Engineering Conference, (RE'21). Notre Dame, IN, USA. pp 384-389. 2020. (pdf) (video) (slides) (bibtex)

Sotirios Liaskos, Ibrahim Jaouhar. Towards a Framework for Empirical Measurement of Conceptualization Qualities. In Proceedings of the 39th International Conference on Conceptual Modeling (ER'20). Vienna, Austria. pp 512-522. 2020. (pdf) (slides) (video) (R Markdown)

Sotirios Liaskos, Mehrnaz Zhian, Ibrahim Jaouhar. Experimental practices for measuring the intuitive comprehensibility of modeling constructs: an example design. In Proceedings of the 3rd International Workshop on Empirical Methods in Conceptual Modeling (EmpER'20). Vienna, Austria. 2020. (pdf) (video)

Sotirios Liaskos, Wisal Tambosi. Factors Affecting Comprehension of Contribution Links in Goal Models: An Experiment. In Proceedings of the 38th International Conference on Conceptual Modeling (ER'19). Salvador, Brazil.pp 525-539. 2019. (pdf) (R Markdown)

Sotirios Liaskos, Bo Wang, Nahid Alimohammadi. Blockchain networks as adaptive systems. In Proceedings of the 14th International Symposium on Software Engineering for Adaptive and Self-Managing Systems (SEAMS@ICSE 2019). Montreal, QC, Canada. pp 139-145. 2019. (pdf) (R Markdown) (IEEE Explore Link)
 
Yasser González-Fernández, Saeideh Hamidi, Stephen Chen. Efficient elicitation of software configurations using crowd preferences and domain knowledge. Automated Software Engineering (AUSE). 26(1). pp 87-123. 2019.

Sotirios Liaskos, Teodora Dundjerovic, Grace Gabriel. Comparing Alternative Goal Model Visualizations for Decision Making: an Exploratory Experiment. In Proceedings of the 33rd Annual ACM Symposium on Applied Computing (SAC'18). Pau, France. pp.1272-1281. 2018. (pdf) (R Markdown)

Sotirios Liaskos, Bo Wang. Towards a Model for Comprehending and Reasoning about PoW-based Blockchain Network Sustainability. In Proceedings of the 33rd Annual ACM Symposium on Applied Computing (SAC'18). Pau, France. pp.383-387. 2018. (pdf)

Sotirios Liaskos, Alexis Ronse, Mehrnaz Zhian. Assessing the Intuitiveness of Qualitative Contribution Relationships in Goal Models: an Exploratory Experiment. In Proceedings of the 11th ACM/IEEE International Symposium on Empirical Software Engineering and Measurement (ESEM'17). Toronto, Canada. pp. 466-471. 2017. (pdf) (R Markdown) (IEEE Xplore Link)

Norah Alothman, Mehrnaz Zhian and Sotirios Liaskos. User Perception of Numeric Contribution Semantics for Goal Models: an Exploratory Experiment. In Proceedings of the 36th International Conference on Conceptual Modeling (ER'17). Valencia, Spain. pp 451-465. 2017. (pdf) (R Markdown) (the final publication is available at Springer via this link.)

Fatima Alabdulkareem, Nick Cercone, and Sotirios Liaskos. Goal and Preference Identification through Natural Language. In Proceedings of the 23rd IEEE International Requirements Engineering Conference (RE'15). Ottawa, Canada. pp 56-65. 2015. (pdf)

Saeideh Hamidi, Perilkis Andritsos and Sotirios Liaskos. Constructing Adaptive Configuration Dialogs using Crowd Data. In Proceedings of the 29th ACM/IEEE International Conference on Automated Software Engineering (ASE'14). Västerås, Sweden. pp 485-490. 2014. (pdf) (ACM)

Sotirios Liaskos, Shakil M. Khan, Mikhail Soutchanski and John Mylopoulos. Modeling and Reasoning with Decision-Theoretic Goals. In Proceedings of the 32th International Conference on Conceptual Modeling (ER'13). Hong-Kong, China. pp 19-32. 2013. (pdf) (the final publication is available at  Springer)

Sotirios Liaskos, Saeideh Hamidi and Rina Jalman. Qualitative vs. Quantitative Contribution Labels in Goal Models: Setting an Experimental Agenda. In Proceedings of the 5th International i* Workshop (iStar'13). Valencia, Spain. pp 37-42. 2013. (CEUR link)

Marsha Chechik, Jocelyn Simmonds, Sotirios Liaskos, Shiva Nejati, Mehrdad Sabetzadeh and Rick Salay. PWWM: A Personal Web Workflow Methodology. The Personal Web. pp 11-48. 2013.

Sotirios Liaskos, Marina Daoud Jungblut and John Mylopoulos. From intentions to code: exploring the life of user goals in two web-based systems. IET Software, 6(2). pp 103-113. 2012.

Sotirios Liaskos, Shakil M. Khan, Marin Litoiu, Marina Daoud Jungblut, Vyacheslav Rogozhkin and John Mylopoulos. Behavioral adaptation of information systems through goal models. Information Systems, 37(8). pp 767-783. 2012.

Sotirios Liaskos, Rina Jalman and Jorge Aranda. On eliciting contribution measures in goal models. In Proceedings of the 20th IEEE International Requirements Engineering Conference (RE'12). Chicago, IL, USA. pp 221-230. 2012. (pdf) (IEEE Explore)

Sotirios Liaskos, Sheila A. McIlraith, Shirin Sohrabi and John Mylopoulos. Representing and reasoning about preferences in requirements engineering. Requirements Engineering, 16(3). pp 227-249. 2011.

Sotirios Liaskos, Marin Litoiu, Marina Daoud Jungblut and John Mylopoulos. Goal-Based Behavioral Customization of Information Systems. In Proceedings of the 23rd International Conference on Advanced Information Systems Engineering (CAiSE'11). London, UK. pp 77-92. 2011. (long techrep) (the original publication is available at  Springer)

Scott Munro, Sotirios Liaskos and Jorge Aranda. The Mysteries of Goal Decomposition. In Proceedings of the 5th International i* Workshop (iStar'11). Trento, Italy. pp 49-54. 2011. (pdf)

Sotirios Liaskos and Vyacheslav Rogozhkin. Applying preference-based customization. In Proceedings of the 19th IEEE International Requirements Engineering Conference (RE'11). Trento, Italy. pp 353-354. 2011.

Sotirios Liaskos and John Mylopoulos. On Temporally Annotating Goal Models. In Proceedings of the 4th International i* Workshop (iStar'10). Hammamet, Tunisia. pp 62-66. 2010. (CEUR link)

Sotirios Liaskos, Sheila A. McIlraith, Shirin Sohrabi and John Mylopoulos. Integrating Preferences into Goal Models for Requirements Engineering. In Proceedings of the 18th IEEE International Requirements Engineering Conference (RE'10). Sydney, NSW, Australia. pp 135-144. 2010. (pdf)

Bradley Simmons, Hamoun Ghanbari, Sotirios Liaskos, Marin Litoiu and Gabriel Iszlai. Hierarchical Self-Optimization of SaaS Applications in Clouds. Software Engineering for Self-Adaptive Systems II. pp 354-375. 2010.

Sotirios Liaskos, Sheila A. McIlraith and John Mylopoulos. Towards Augmenting Requirements Models with Preferences. In Proceedings of the 24th IEEE/ACM International Conference on Automated Software Engineering (ASE'09). Auckland, New Zealand. pp 565-569. 2009.

Jordi Cabot, Steve M. Easterbrook, Jennifer Horkoff, Lysanne Lessard, Sotirios Liaskos and Jose-Norberto Mazón. Integrating sustainability in decision-making processes: A modelling strategy. In Proceedings of the 31st International Conference on Software Engineering (NIER Track) (ICSE-NIER'09). Vancouver, BC, Canada. pp 207-210. 2009.

Yijun Yu, Alexei Lapouchnian, Sotirios Liaskos, John Mylopoulos and Julio Cesar Sampaio do Prado Leite. From Goals to High-Variability Software Design. In Proceedings of the 17th International Symposium on Foundations of Intelligent Systems (ISMIS'08). Toronto, ON, Canada. pp 1-16. 2008.

Markus Strohmaier, Mathias Lux, Michael Granitzer, Peter Scheir, Sotirios Liaskos and Eric S. K. Yu. How Do Users Express Goals on the Web? - An Exploration of Intentional Structures in Web Search. In Proceedings of the WISE'07 International Workshop on Collaborative Knowledge Management for Web Information Systems (WEKnow). Lecture Notes in Computer Science (LNCS) 4832. Nancy, France. pp 67-78. 2008.

Mehrdad Sabetzadeh, Shiva Nejati, Sotirios Liaskos, Steve M. Easterbrook and Marsha Chechik. Consistency Checking of Conceptual Models via Model Merging. In Proceedings of the 15th IEEE International Requirements Engineering Conference (RE'07). New Delhi, India. pp 221-230. 2007.

Sotirios Liaskos, Lei Jiang, Alexei Lapouchnian, Yiqiao Wang, Yijun Yu, Julio Cesar Sampaio do Prado Leite and John Mylopoulos. Exploring the Dimensions of Variability: a Requirements Engineering Perspective. In Proceedings of the First International Workshop on Variability Modelling of Software-Intensive Systems (VaMoS 2007). Limerick, Ireland. pp 17-26. 2007.

Alexei Lapouchnian, Yijun Yu, Sotirios Liaskos and John Mylopoulos. Requirements-driven design of autonomic application software. In Proceedings of the 2006 conference of the Centre for Advanced Studies on Collaborative Research (CASCON'06). Toronto, ON, Canada. pp 80-94. 2006.

Sotirios Liaskos, Alexei Lapouchnian, Yijun Yu, Eric S. K. Yu and John Mylopoulos. On Goal-based Variability Acquisition and Analysis. In Proceedings of the 14th IEEE International Requirements Engineering Conference (RE'06). Minneapolis, MN, USA. pp 76-85. 2006. (pdf) (IEEE Explore)

Alexei Lapouchnian, Sotirios Liaskos, John Mylopoulos and Yijun Yu. Towards requirements-driven autonomic systems design. ACM SIGSOFT Software Engineering Notes, 30(4). pp 1-7. 2005.

Sotirios Liaskos, Alexei Lapouchnian, Yiqiao Wang, Yijun Yu and Steve M. Easterbrook. Configuring Common Personal Software: a Requirements-Driven Approach. In Proceedings of the 13th IEEE International Requirements Engineering Conference (RE'05). Paris, France. pp 9-18. 2005. (pdf) (IEEE Explore)

Yijun Yu, Yiqiao Wang, John Mylopoulos, Sotirios Liaskos, Alexei Lapouchnian and Julio Cesar Sampaio do Prado Leite. Reverse Engineering Goal Models from Legacy Code. In Proceedings of the 13th IEEE International Requirements Engineering Conference (RE'05). Paris, France. pp 363-372. 2005.

Bowen Hui, Sotirios Liaskos and John Mylopoulos. Requirements Analysis for Customizable Software Goals-Skills-Preferences Framework. In Proceedings of the 11th IEEE International Requirements Engineering Conference (RE'03). Monterey Bay, CA, USA. pp 117-126. 2003. (ps) (IEEE Explore)

Teaching

- ITEC2010 - Systems Analysis and Design I
- ITEC4010 - Systems Analysis and Design II
- ITEC3230 - Designing User Interfaces
- ITEC4040 - Requirements Management
- ITEC6970 - Special Topics in IT: Systems Architecture