1. CONTROL CHARTS
1. These charts are used for process control. Statistical device used for control of repetitive process.
2. Developed by Dr. W.A. Shewart. Variability does exist in all repetitive processes.
Variation due to chance causes.
Variation due to assignable causes.
Variation in any manufactured product is INEVITABLE

2. Statistical Tools:-
Frequency distribution
Control chart
Acceptance sampling
Analysis of data
Benefits:-
Efficiency
Reduction of Scrap
Easy detection of fault
Quality improvement
Adherence to specification
Increase output

3. Chance cause – Inevitable. Difficult to trace
Chance cause – Inevitable. Difficult to trace. Due to inherent characteristic of process or machine.
Assignable cause – Can be traced & detected. Due to
Difference among workers.
Differences among machines.
Differences in each of these over time.
Differences in their relationships

4. CONTROL CHARTS
X & R charts (measurement of quality characteristic)
p chart (chart for fraction defectives or rejected)
c chart (chart for no. of defects/units) or non-conformities
Construction of chart :-
Choice of variable (likely to reduce cost)
Basis of subgroup
Size of subgroup
Size of subgroup (4 or 5)
Frequency of sampling
Control limits (+ 3 σ) 

5. X BAR & R CHARTS

6. PROCESS CAPABILITY

7. PROCESS CONTROL VS SPECS

8. ATTRIBUTE CONTROL CHART

9. P CHART

10. C CHART

11. CONTROL CHART PATTERN