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A constraint specifies a relation or condition that must be maintained in a system. It is common for a single user graphic system to specify some constraints and provide methods to satisfy these constraints automatically. Constraints are even more useful in collaborative systems, which can confine and coordinate concurrent operations, but satisfying constraints in the presence of concurrency in collaborative systems is difficult. In this article, we discuss the issues and techniques indoi:10.1007/1-4020-4023-7_10 dblp:conf/ecscw/LinCSD05 fatcat:q4oew52iirb3nj4tdmek3sy5gy