• LP is a versatile tool to handle Aggregate Production Planning Problems with a variety of linear costs and constraints
  
• The Transportation Model is capable of dealing with problems with piecewise linear convex costs (regular time, overtime, subcontracting)
  - No shortage case handled by a simple greedy procedure
  - Case with shortages treated by regular transportation problem procedure
  
• The case of concave and arbitrary costs can be solved using a shortest path procedure on a network.
  - Both cases with and without shortages can be handled
  
• Sample problems for both procedures were solved to illustrate the procedures