This is a draft of the paper presented at ETPCS 2009, Pisa, Italy, 17-19th June 2009 (http://published.eptcs.org/). DOI: 10.4204/EPTCS.2.3Service-Oriented Computing delivers the promise of configuring and reconfiguring software systems\ud to address user’s needs in a dynamic way. Context-aware computing promises to capture the user’s\ud needs and hence the requirements they have on systems. The marriage of both can deliver ad-hoc\ud software solutions relevant to the user in the most current fashion. However, here it is a key to gather\ud information on the users’ activity (that is what they are doing). Traditionally any context sensing\ud was conducted with hardware sensors. However, software can also play the same role and in some\ud situations will be more useful to sense the activity of the user. Furthermore they can make use of the\ud fact that Service-oriented systems exchange information through standard protocols. In this paper\ud we discuss our proposed approach to sense the activity of the user making use of software
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