3. Experimental case The case study considers the evaluation about the performance of plastic injection machines to outline continuous improvement strategies. Likewise, a set of four machines and four criteria is proposed. The alternative A1, it is a plastic injection Demag 85T machine which has an injection pressure of 85 tons, clamping force of 1000KN and a heating capacity of 11.1K. Alternative A2, belong to Cincinnati machine which is a plastic injection machine and has an injection power of 85 tons. Alternative A3 depict the Toshiba machine which has a pressure of injection of 220t, how much with a diameter of the screw: 50mm, performs a stroke opening: 800mm, produces an injection volume: 490cm3 and a firing weight of 450g. Alternative A4 represents the fourth option that consists of an injection pressure of 250 tons. At the same time, the set of criteria involved in the problem are the following: 3.1. OEE Represent criterion is used to measure the quality, productivity and availability of the machines, this type of criterion and belong to quantitative criteria. 3.2. Setup Depict criterion gives us the waiting times in the part number changes, the criterion is quantitative. 3.3. Operation time This criterion gives us information about the run time of the machine per piece generated. This type of criterion is quantitative. 3.4. PPM This criterion tells us the pieces per million produced with a quality that does not approve the quality criteria this criterion is evaluated qualitative. 3.5. Waste (Scrap) Indicates the waste generated by this process was evaluated qualitatively