ABSTRACT
At the present time, software engineering has proposed many 
techniques to improve the software development process, but the
final goal has still not been satisfied. In most cases, the final 
software product does not satisfy the real needs of the final 
customers of the business where the system will be operated.
One of the main issues of current research works is the lack of a
systematic approach to map each modeling concept of the problem
domain (organizational models), into the corresponding conceptual 
elements of the solution space (object-oriented conceptual models).
The main objective of this thesis is to provide a methodological 
approach that enables the generation of conceptual and requirements
models from organizational descriptions. We use three different, but 
complementary disciplines (organizational modeling, software 
requirements and conceptual modeling) in order to achieve this 
objective.
The thesis describes a requirements elicitation process that enables
analysts to create a business model that represents the current 
situation of the enterprise. We consider that this model, which 
reflects how the enterprise currently implements its business 
processes, is the correct source to determine the expected 
functionality of the system-to-be. A process to identify the elements
that are relevant to be automated from the business model is also 
proposed in this work. As a result of this process, an intermediate 
model is generated that represents the software system requirements. 
Finally, we present a set of systematic guidelines to generate an object-
oriented conceptual schema from the intermediate model. We 
also explore the generation of a late requirements specification from
the intermediate model as an alternative solution for the thesis 
objectives. A specific object-oriented conceptual modeling case tool 
(OO-Method) is used to detail the software requirements of the 
system-to-be. The OO-Method case tool has also been used to deal 
with the aspects that are associated to the generation of object-
oriented conceptual schemas. 
The main contribution of the thesis is to make the model 
transformation process systematic by proposing a model-driven 
based approach that uses rules, algorithms and patterns to derive both
an object-oriented conceptual model and a requirements model from 
the organizational context.