 Introduction  Methodology  Case Study 1 : Event-B and RODN  Case Study 2 : B-Method and Atelier B  Observations and Analysis  Conclusion

To evaluate the usability of Event-B and Rodin compared to B-Method and Atelier B Demonstrate how easy it is to learn Event-B with Rodin Focus on novice users – context of education

B-Method - method of software development based on B - programming language code is developed from specifications. - relates to the B language, refinement, proof and its related tools. - Supporting tool : Atelier B Event-B - Evolution of B - Supporting tool : Rodin

 Case Study Demonstration  Case Study 1 : Event-B and Rodin  Case Study 2 : B-Method and Atelier B  Usability Evaluation  Cognitive Dimensions Framework  ISO Usability criteria  Generic case study evaluation criteria suggested by Rodin

 Case Study Demonstration  Case Study 1 : Event-B and Rodin - Simple Railway System  Case Study 2 : B-Method and Atelier B - Simple Jukebox System

 Usability Evaluation  Cognitive Dimensions Framework - CD questionnaire ; 14 CDs  ISO Usability criteria - Learnability and Understandability  Generic case study evaluation criteria suggested by Rodin - 6 criteria

types and availability of abstraction mechanisms. -high level of abstraction for both notations Relates to learnability and understandability

how closely related is the notation to the end result

Are similar semantics expressed in similar syntactic forms. - High level of consistency for both notations Relates to learnability and understandability

Verbosity of a language High level for novice users of both notations Mathematical symbols - short and have 1 interpretation Expressions long-winded and complicated- difficult for novice users compared to experts Relates to learnability and understandability

Does the notation invite mistakes High level for novice users of both notations Relates to learnability and understandability

Did tasks require a high demand of mental effort. High level for novice users of both notations Need to understand set theory and 1 st order logic Need to get familiar with mathematical symbols Need to get familiar with ASCII symbols Relates to learnability and understandability

Does the notation invite mistakes

whether the work-to-date can be checked at any time Dependent on the tool Both tools have option to save work till-date Shows error for dependencies Related to learnability and understandability

the ability to provide any extra information in means other than a formal syntax. Use English for comments Use ‘Pretty Print’ for indentation ASCII symbols to represent mathematical symbols

resistance to change High level of repetition viscosity Have to manually change name of variable No auto-update available in both tools Related to learnability and understandability

ability to view components easily/ ability to place components side by side

The Rodin tool is much more user-friendly, attractive and easy to use. Easier to learn the Event-B notation with Rodin Rodin provides good user manual Existing B tools are tedious

Thank You Q&A