The first version of Abita+ dates back to 2001. Concepts are, in the computer world as in other domains, concepts that are discovered and forgotten, then rediscovered in the belief that they are innovative or original. At the dawn of the 20th century, to explore architectural solutions, there were three ways. The first was to mimic analogical tools and methods. This is the virtual drawing board such as AutoCad for example. The intellectual process is the same as for hand drawing, it is only the ease of corrections, re- editing and duplication that make it a very productive tool. The second path, less known and somewhat forgotten, is that of declarative modeling. In this method, the idea is to start with the expected result and work backwards through the inductive chain.