Question

what do you know about demerit system?suggest atleast two nonmacufacturing scenarios in which attributes control charts could be useful for process monitoring.question from total quality management

Answer 1

Demerit System:

Demerit charts are created by H.F. Dodge. These charts are constructed as a means to chart products with more than one kind of possible defects.

The defects can be categorized into 4 types based on the seriousness of the defect.

1. Class A defect - Very serious defect which implies operation failure and the unit is unfit for service.

2. Class B defect - Severity is less compared to Class A defect. But high chances of operating system failure.

3. Class C defect - Less severe than Class B defect. Likely to cause trouble. High maitenance cost and decreased life of the operating system can be expected here.

4. Class D defect - Not severe. This will not cause the operating failure. But minor defects and maintenance costs can be expected.

Attribute control charts: Attribute control charts are designed for count data, i.e., we undesirable or unusual incidents are being counted.

Family of attribute charts include p-chart, np-chart, c-chart and u-chart.

Non-manufacturing scenarios where attribure control charts are useful:

1. Healthcare - To optimize patient wait times, to track repeated diagnostic tests.

2. Finance - To track data entry errors, to track invoice processing time.