When comparing the research on service topics to those research activities that focus on material goods, an obvious gap can be observed: While there exists a broad range of models, methods and tools for the development of goods, the development of services has hardly become a topic of scientific literature. An approach for capturing services as an R&D object is presented in the following under the general heading of "service engineering", and an attempt made to systematise the development of services.

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For a Direct Manipulation interface, transfer of skill between text and graphics editing tasks has been investigated. A learning experiment has been carried out with two groups of novice users starting with a series of sessions in one task domain and then switching over to the other domain. The empirical results are discussed in the framework of the "cognitive complexity" theory of Polson and Kieras.

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