Op 19-01-13 19:18, Michiel Vermandel schreef: Yes, but they are hard to detect automatically. One red-light flashing is by using <problemStatisticType>BEST_SOLUTION_CHANGED</problemStatisticType> http://docs.jboss.org/drools/release/5.5.0.Final/drools-planner-docs/html... I 'd like to automate detection of it: https://issues.jboss.org/browse/PLANNER-120 If you see this, you probably have a score trap: https://issues.jboss.org/secure/attachment/12359971/badBecauseScoreTrap.png Then run the solver again, but terminate it in the middle of that first flat line and write the solution. Then examine that solution for score traps. Just pushed a new image and some docs explaining score traps better, as several users might have encountered it: https://github.com/droolsjbpm/drools-planner/commit/e9034f4ac60e7a4bd65f7...