The use of Computer Aided Software Engineering (CASE) tools has had a major impact on the productivity and quality of products (software) by providing automated support for tasks involving analysis, design, error checking, consistency validation, documentation, reliable code generation through tests, and integration. A wide variety of such tools is available on the market and these vary in their ability to provide support for the different stages or activities of the life cycle, and in the degree of integration and cost. The purpose of this article is to present the development of a Decision Support System to assist in selecting CASE tools. The system incorporates the integration of two technology-oriented decision models and the organization of each of them. These models cover a series of metrics on which the decision-making process will be based. These two models were developed and adapted to meet Venezuelan organizations’ need for this type of technology. This need is the reflection of a complex process in which there are different underlying criteria.