This paper introduces selected latest results of a research in situation based product
definition. The current representative method of product definition applies situation
based control of product feature parameters. In the presented method, application
of situation control was improved by placing it from the product feature level to
the product behavior level. Because the feature level situation control is a proven
key technology in product lifecycle management systems, the new behavior level product
definition process controls the process of the feature level product definition. This
paper starts with a comparison of the feature and the behavior level product feature
definition. Following this, the product request, product behavior, and context structure
feature definitions are introduced as main elements of the behavior level product
feature definition process. Next, a new context structure and its connection with
the feature sequence is exampled and discussed. Finally, application of the proposed
method in product lifecycle management systems is outlined.