... 110–119.HACKOS,J .AND REDISH, J. 1998. User and Task Analysis for Interface Design. John Wiley and Sons, Inc., New York, NY.HALLN¨AS, L., JAKSETIC, P., LJUNGSTRAND, P., REDSTR¨OM,J. ,AND SKOG, T. 2001. Expressions; ... 2002.122•Halln¨as and Redstr¨om and epistemology and ethics on the other. Beauty and simplicity are often usedas strong criteria for the correct path to deep theorems and good theories inareas ... basisof a collection of generic expressions, that is, the expressions associated withphones and phoning. To do this, we typically bracket functionality and focus onthe expressions of a mobile phone...