The purpose of this document is to provide technical specifications concerned to the Design of the University Unified Inventory System - Web Portal, of the UIfA. The Team of Developers used a Feedback Waterfall approach to build up the system, under an Object Oriented paradigm. The architectural model followed was the Model-View-Controller, mixed with a Mapper layer between the database and the Model. Some of the patterns utilized in the developing of the System were the Observer Pattern, the Command Pattern, and the Mapper Pattern.