In spite of the general appreciation of the need for usability evaluation, systematic evaluation studies of new products are the exception. This paper describes the evaluation conducted at Siemens of the prototype for a novel interface of a cellular telephone. The interface design itself is presented followed by a description of the test method, the 80 subjects sample, and the results. The conclusions focus on lessons learnt through the study and on the need of intergrating usability evaluation into the product cycle.
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