Quality Assurance Analytical Methods
Design of Experiments
Objective: Conduct statistical analysis on
effect of various factors on a variable.
Application of This Method:
- Determined optimal process conditions for
customer satisfaction and product performance.
- Determined optimal material mix for product
performance.
Statistical Process Control
Objective: Use statistics to monitor process
and identify when processes are out of control
Application of This Method:
- Monitored production processes to determine
and assess performance.
- Reviewed Statistical Process Control results
to identify improvements.
- Identified root causes of variation in
production processes.
Repeatability and Reproducibility Studies
Objective: Evaluate test methods to ensure
same results are obtained from the same individual
and that the results are the same when tested by
multiple individuals.
Application of This Method:
- Determined if present test methods were
acceptable.
- Evaluated test equipment and methods.
- Evaluated new test equipment and methods
after equipment changes.
Correlation Analysis
Objective: Evaluate relationship between two
variables.
Application of This Method:
- Used this technique to determine trend of
two variables.
- Evaluated cause and effect of two process
variables.
- Used for analyzing process output affected
by input variables.
Taguchi Methods
Objective: Conduct designed experiments to
determine the effect of variables on on a process.
Application of This Method:
- Used to evaluate methods of increasing
production by assessing optimal mix of process
variables.
- Identified causes of variation for product
design to significantly lower production costs.
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