This paper introduces the notion of context in the architectural learning process. Designing and learning are social processes in which knowledge is learned in applied situations. A WEB-based apllication, called "Architectural Contextual Library", is presented as a means to arrive to a collaborative learning environment in architecture projects. The paper discuss the types of knowledge involved in architectural design, the difficulties in formalizing and sharing knowledge, and the implementation of a visual argumentation process through a design example – the design of stairs in a typical house.