Abstract: In the present invention, a computer program product comprises computer executable code for building software applications, the computer program including a model execution application implementing a meta-model (1) which is adapted to be populated with user inputs to generate one or more models (3, 6-8). The model execution application also includes a predefined infrastructure model (5). The program is adapted to populate the meta-model (1) with data (17) input by a user to generate a model (11) and subsequently associate said model (3) with the predefined infrastructure model (5) by populating the infrastructure model with implementation data (13) associated with said model so as to define an executable specific software application. In the preferred embodiment, the infrastructure model (5) is defined in terms of the same meta-model (1).