This project Entitled “Designing a Diagnostic Expert System for Diabetes’, was a part of Master of Philosophy in Library and Information Science, submitted to Annamali University on 2007, supported by Dr. Mohans Diabetes Research Foundation and Madras Diabetes Research Centre. Thanks to all the guide and co-ordinators for making the project successfully. This software (DESDIAB) freely accessible as an open source software available at https://github.com/sudhakarcvs/desdiab