This thesis studies some problems which are important in establishing interactive
problem solving systems. An interactive problem solving system is characterized
by the intensive interaction between the user and the system. In order to converge
on a solution which satisfies the user, we present a new problem solving scheme -
user-directed search (UDS) - where the solution search is directed in a step-by-step
manner by the user. Because of its wide applicability, UDS can be very useful...[Show more]
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