3 Josep Lluis Arcos 2001 T-Air : a case-based reasoning sytem for designing chemical absorption plants Aha, David W. Watson, Ian Lecture Notes in Artificial Intelligence Springer-Verlag 2080 576-588 In this paper we describe a case-based reasoning application developed for aiding engineers in the design of chemical absorption plants. Based on the notion of flow sheet, the paper describes how the application uses a highly structured representation of cases and similarity criteria based on chemical knowledge for designing solutions following an interactive case-based reasoning approach.