The study was conducted at a manufacturing company where plastic products are produced. This study aims to find out the possible root cause of rejects in a specific product produce at Plastic Department. In this way, implementing statistical approach on determining the possible cause of rejects and also set standards on how to lessen it that can affect the daily production of the said product. It also gives the idea to the management on how to save cost efficiently by reducing the amount of rejects and determine proper measures to be set according to the result. The charts were very helpful on determining what points are out-of-control and how the process to be changed. This study uses Control Charts for Attributes, to identify the out of control points. The Minitab software application is used as a tool to identify the graph which we can examine the out of control points in the process. This study uses observations and quantitative approach to find what is the root cause of tremendous reject made.