The iStar workshop series is dedicated to the discussion of concepts, methods, techniques, tools, and applications associated with i* (iStar) and related goal modelling frameworks and approaches (Tropos, GRL, among others). As in previous editions, the objective of the workshop is to provide a unique opportunity for researchers in the area to exchange ideas, compare notes, promote interactions, and forge new collaborations. Expected outcomes include the communication of early results and new ideas to fellow researchers for feedback, the identification of the current problems and promising future research directions and the fostering of awareness, collaboration and interoperability in the area of tool development.

The focus of the iStar workshop series is quite specific and provides an additional forum for the RE community to exchange the latest ideas and research on goal modeling. In line with the ER’21 conference theme “Conceptual Modeling in an Age of Uncertainty”, this edition of the iStar workshop series also seeks to explore how i* may be best applied to deal with uncertainty. For example, how to reasonably model uncertainty in i*? Can i* contributes to requirements uncertainty detection? How uncertainty affects i*-based requirements analysis?


Contributions should be maximum 6 pages on LNCS format, describing current and ongoing research related to the i* framework. This year, we welcome four types of papers: technical papers, empirical evaluation and experience reports, position papers, and tool papers.

Submissions should provide an overview of the research objectives and describe contributions, including any related tools and evaluation experience. Contributions should outline ongoing and future work and provide key references.

Tool papers should include references to download information, documentation, and system features. Authors of tool papers will be invited to present a demo in a tool fair during the workshop. We encourage those submitting a tool paper to create or update a page on the i* wiki. Contact istarwiki@dbis.rwth-aachen.de if you require a new user name and password for the wiki.

All submissions should be uploaded to Easychair: https://easychair.org/conferences/?conf=istar21.

All submissions will be peer-reviewed and accepted works will be published in the CEUR Workshop Proceedings Series.

Topics of Interest
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The workshop is open to the public, the topics of interests include, but are not limited to:

· The role of goal modelling in digital transformation processes

· Adaptive requirements-driven systems

· Agent-oriented systems development

· Business intelligence and data analytics

· Business modeling

· Business process analysis and design, reengineering

· Business, service, and software ecosystems

· Enterprise, systems, and organizational architecture

· Evaluation, verification and validation

· Experience reports and case studies

· Evolution, adaptation, and system dynamics

· Formalizing or extending iStar 2.0

· i* modeling techniques and metamodels: i* modeling concepts, variations and extensions

· Knowledge management

· Law and regulatory compliance

· Mobile and cloud requirements engineering

· Model analysis and contextual reasoning

· Networking or integration with other modeling languages or techniques

· Novel applications of i*

· Ontological foundations

· Requirements engineering

· Scalability and uncertainty in modeling

· Security requirements engineering, privacy, and trust

· Socio-technical systems

· Software engineering processes and organizations

· Strategy modeling and business model innovation

· Tools, visualization, and interaction

· Variability and personalization