FIGURE 20-28. Hugging the centerline.

ity. To see whether there is hugging of one of the control limits, draw a line two-thirds of the distance between the centerline and each of the control lines. There is abnormality if 2 out of 3 points, 3 out of 7 points, or 4 out of 10 points lie within the outer one-third zone. The abnormalities should be evaluated for their cause(s) and the corrective action taken. Figure 20-28 demonstrates data hugging the LCL.

Out of control. An abnormality exists when data points exceed either the upper or lower control limits. Figure 20-29 illustrates this occurrence.

In control. No obvious abnormalities appear in the control chart. Figure 20-30 demonstrates this desirable process state.

Project Management Made Easy

Project Management Made Easy

What you need to know about… Project Management Made Easy! Project management consists of more than just a large building project and can encompass small projects as well. No matter what the size of your project, you need to have some sort of project management. How you manage your project has everything to do with its outcome.

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