Standard Formulations

Sometimes it helps if a modeler has a toolbox with a number of standard formulations available for recurring problems so attacking new situations becomes just an incremental effort. An example is discussed here: http://code.msdn.microsoft.com/solverfoundation/Thread/View.aspx?ThreadId=1888. The original poster got a little bit lost by reinventing a formulation for a standard production scheduling problem with a twist. Reusing the standard inventory balance formulation helped simplify the model after which adding the extra complication of allowing next day delivery was easy.