At the beginning of this project, Citidocs users only utilized one application developed in Visual Basic with a client/server architecture known as Citidocs Desktop. The interactivity and usability of tools like Visual Basic are far from those usually achieved with a web application run in a browser. For this and other reasons, the development of a Web client for Citidocs posed the following challenges:

• Offer end users usability features similar to the existing Visual Basic application;

• Build a solution bearing in mind that a Web client was being developed in parallel with Citidocs Transaction Server, which was the backend to be used;

• Avoid implementing interactivity in the web application by using a “handcrafted” JavaScript code which cannot evolve or be maintained, as happened earlier with another provider.