So taking toy1.xml as basis; 1) start date = 2014-02-01 end date=2014-02-28 2) Adding 5 more nurses (same type of contract), so 10 total 3) MinNumAssignments to 20, MaxNumAssignments 25 4) Solver assigns about 14 assignments per nurse, not the minimum 20. So the question goes; What would be the easiest route to make sure nurse gets assigned at least the minimum number of shifts? And now this actually leads to bigger question; Shift weight & minimum number of assignments. What would be the easiest way to add more “weight” to night shifts (i.e. night shift = 2 morning/evening shifts). Example; So if minimum number of assignment would be 5, to satisfy you would need to do 2 night shifts and 1 day shifts (or 5 day shifts) Thanks, Karri