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+Real world problems, such as scheduling and routing problems, are often solved by creating constraint models.
+These models are automatically rewritten for the use of dedicated solver programs.
+Over the years, both the size of the problems and approaches taken by the solver programs have significantly changed.
+This has meant that for some applications the rewriting process has become prohibitively inefficient.
+This thesis proposes a more efficient structure for the rewriting process that makes constraint modelling a more powerful and attractive approach.