This repository holds a university project for the course MFES (Formal Methods in Software Engineering), inserted in FEUP's (Faculty of Engineering of the University of Porto) Master in Informatics and Computer Engineering.

The goal of this practical work is to develop, test and document an executable formal model of a high integrity software system in VDM++ using the Overture tool or the VDMTools. At the end of the work, students should have acquired the ability of formally modeling software systems in VDM++, and of demonstrating the consistency of the model.

We were assigned with modelling a distributed printing service. These were the main requirements:

• Have a distributed printing queue based on the type of document (B&W, color, A3, A4);
• Printers are placed in different places/clients (in our abstraction, universities);
• Users (in our case, students) pay with account balance;
• Users may report malfunctions with printers and employees are sent to fix them;
• Show reports with several metrics (e.g. number of documents printed on each printer).

Overture. Not the music notation one, the IDE for developing and analysing VDM models.
It's based on Eclipse.

.vdmpp is the file extension for the formal specification language VDM++.
VDM stands for Vienna Development Method (fancy) and is one of the longest-established formal methods for the development of computer-based systems. The ++ variant is simply an extension which supports modelling of object-oriented and concurrent systems.

It aims to reduce the time coding and fixing bugs in exchange for a more careful planning phase.
Naturally, it can be generated to Java whenever (check the generated folder!).

Experience with the method suggests that the effort expended on formal modeling and analysis can be recovered in reduced rework costs arising from design errors.

Also this course kinda forced us to use it.

Yay, here's the full report!