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A Guide To Alloy

This presentation provides an overview of Alloy, a modeling language inspired by Z. Learn how Alloy allows for automatic verification and visualizing instances of models within a finite scope. Explore how Alloy is used in various real-life applications and find further resources for learning more about the language.

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A Guide To Alloy

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  1. A Guide To Alloy

  2. Introduction • Overview of the Alloy Language • Using Alloy and the Alloy Analyzer • Summary • Quiz (Donuts!) • Q & A About this Presentation

  3. Introduction • Modeling language based on first-order logic • Heavily inspired by Z (Schemas!) • Z is not easily analyzable • Alloy tries to overcome this • Sacrifices some of Z's power to be able to do so About this Presentation

  4. Overview of Alloy • Unlike Z, Alloy is not used to prove correctness. • The Alloy Analyzer allows automatic verification within a finite scope • Relies on Small Scope Hypothesis Scope: Z > Alloy > Test Cases Test cases Scope complete

  5. A Worked Example: Computer Modelling a Computer in Alloy • How can we do this in Alloy? • Aim to represent a computer and its components: • CPU • Memory • HardDisk • Extremely simple example, full power of Alloy better illustrated with bigger examples.

  6. Alloy in Real Life • Example just given was very simplistic • Alloy has been used for much more complex systems, e.g. • Cryptography • Document Structuring • Railway Switching • Taught at many universities around the world

  7. Summary • Alloy is a modeling language inspired by Z. • In contrast to Z, it is automatically analyzable. • The Alloy Analyzer allows visualizing instances of models and checking assertions within a finite scope. • Easy to incrementally explore design ideas • Alloy is a good starting point for beginners to specification languages

  8. Further Resources • Alloy Website : • http://alloy.mit.edu • Our Website : • http://www.doc.ic.ac.uk/project/2007/271j/g06271j01/Web • Software Abstractions • by Daniel Jackson

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