Manufacturing Engineering Statistical Process Control (SPC) Tools: Pie Chart Copyright © Texas Education Agency, All rights reserved. 1

Bell Work Activity Please take out a sheet of paper and complete the following. A.Write the following headings across the top of the page in four columns: Black, Brown, Blonde, and Red. B.Look around the classroom and count the total number of students with hair color matching each category. When you are done, your list should have one color and one number underneath it. C.Now, think of a way to illustrate this data in one image that would be easy for most readers to understand. 2 Copyright © Texas Education Agency, All rights reserved.

A. There are several important terms and definitions students need to know. B. Complete SPC Tools: Pie Chart Matching Terms and Definitions handout. C. Students may work in groups. Warm-Up Activity Statistical Process Control (SPC) Tools: Pie Chart Matching Terms and Definitions 3 Copyright © Texas Education Agency, All rights reserved.

Overview In Statistical Process Control (SPC), we gather data from work processes to gain a better understanding of variation issues. We use this knowledge to develop corrective actions to reduce or eliminate variation and create a continuous improvement culture within the manufacturing organization. The use of SPC tools gives an organization the potential to build world-class quality into their manufacturing process. 4 Copyright © Texas Education Agency, All rights reserved.

Purpose of Pie Charts Pie charts are very popular and used in a variety of publications. When used correctly, the pie chart gives us the ability to quickly compare the relationship between the individual sections of data (or slices) to the entire data set (or whole pie). When creating a pie chart, it is important to make sure that o the total number of sections added together equals the whole data set, and o only two to six slices are used. 5 Copyright © Texas Education Agency, All rights reserved.

Statistical Process Control Terms Metrics Resources Real-time data Survey Pie Chart Brainstorming Variation Exploded Pie Chart 6 Copyright © Texas Education Agency, All rights reserved.

“Flawed” Pie Chart 7 Copyright © Texas Education Agency, All rights reserved.

Normal Pie Chart 8 Copyright © Texas Education Agency, All rights reserved. 669 students total eat in the cafeteria

Exploded Pie Chart 9 Copyright © Texas Education Agency, All rights reserved. 669 students total eat in the cafeteria