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This paper describes the design and impact of a face-to-face computer supported collaborative learning activity named collaborative answer negotiation activity (CANA). CANA primarily involves face-to-face interactions among students supported by wirelessly interconnected mobile devices to solve collaboratively a set of multiple-choice questions. The learning outcomes of a CANA applied in two computer science courses are presented. Better results were obtained in a course where reasoning and deduction capacities were important than there were in a technical one where students were required to learn specific knowledge and apply it. A CANA design is described that will permit its reuse in various instructional scenarios. This design is defined as a collaborative learning activity pattern and is specified using IMS learning design, an established method of learning scenario description. The application of this …