Assignment 3 Delta Plastics Inc (B)

Running Head: QUALITY MANAGEMENT

Case Analysis Delta Plastics, Inc.

Statistical process control constitutes tools like three sigma control charts or the process-behavior charts. These charts also known as Shewhart charts so called on the name of its inventor Walter Shewhart. Shewhart chart is a statistical tool for monitoring and controlling quality of manufacturing process. Thus, a control chart is a graphical representation of some process measurement functions against time. It was later extended by W. Edward Deming to the total quality improvement in all areas of an organization.

It is being utilized by the Delta Plastics Inc. to analyze and determine whether the production process of plastic products is in a state of statistical control or not . Howsoever controlling of the production process is found to receive variations that exist in the output and its measurement. The variations occur due to random or special causes. If the variation is due to random causes alone, the process is said to be in-control.

The control chart helps in detecting and understanding presence of special causes of variation. In order to deal and tackle defects in the products and to make quality products available to the consumers, the control chart for product so prepared by standard material and for product prepared by super plastic would help in understanding the areas to be focused and controlled.

For making use of control charts, firstly the process parameter which needs to be monitored is identified. According to target value for the parameter under consideration, centerline of the plot is made. The process measurements are divided into samples by time. The points which represent some function of the process measurement within each group aids in estimation of the target value. The points plotted on the graph are compared to a pair of control limits.

The 3-sigma control chart prepared for the standard material clearly gives the reflection of the process that can be...