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...The optimization of production planning and scheduling a real case study in ice cream industry mariana pedroso casal ribeiro de carvalho master industrial engineering management instituto superior tecnico universidade tecnica lisboa utl abstract as other segments food has its own features that influence processes amongst these we identify changeover tasks products shelf life perishability multiple deliveries during horizon rms procurement inventory control aspects have been often left out when studying within batch industries thus problem seeks an optimal solution for dairy company where methodology was proposed to address main this based on integration two supply contracts at level mixed integer linear programming milp models are developed aspect is integrated operation extending them explore different contractual relationships between suppliers applying rtn both mathematical approaches applied present order evaluate which contract type more suitable process terms raw material costs f...