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/Contents (1 Introduction\rThere is a growing interest in service oriented computin\
g \(SOC\) in recent years\r[14]. Central to SOC is the notion of servic\
e which can broadly be considered as\ra software component that represen\
ts some computational or business capability.\rBy allowing services to b\
e advertised declaratively, discovered dynamically and\rinvoked remotely\
, SOC makes it possible for users to locate, select and execute\rservice\
s without having to know how and where they are implemented. This new\rc\
omputing paradigm oers great potential for agent-based e-commerce appli\
ca-\rtions [57]. For example, vendors may wish to identify suitable par\
tners from\rtime to time to form a virtual organisation [8] so that they\
together can compete\rbetter in the market, and consumers would always \
want to select the services\rthat best serve their interests. All such \
match-making tasks can potentially\rbe performed by the agents automati\
cally in an SOC environment.\rIn this paper, we consider the problem of \
quality of service \(QoS\) manage-\rment in SOC. This is an important pr\
oblem to consider because, just like in any\rother business environment,\
it is possible to have several service providers \(SP\))
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