The OO-Method and Software Production from Models.- Let's Get Philosophical.- The Purpose of this Work.- The Need for New Development Environments.- Object-Oriented Modelling as the Starting Point.- The OO-Method.- Conceptual Modelling: About the Problem Space.- Conceptual Modelling Primitives.- Object Model.- Dynamic Model.- Functional Model.- Presentation Model.- Conceptual Modelling of Legacy Systems.- Conceptual Model Validation.- Conceptual Model Compilation: From the Problem Space to the Solution Space.- Transforming Models into Applications.- Requirements for the Compilation of Conceptual Models.- Application Execution Strategy.- Application Architecture.- Transformation Strategy.- Building a Conceptual Model Compiler.- Issues with Other Approaches.- Analogies Between OO-Method and MDA.- The OO-Method Development Process.- OO-Method Implementations.- Conclusions.- Conclusions.