**Interpretation of the Graphs:**
Step 1: Measurement Stability

A stable measurement system shows no out of control points or "non-random" patterns or trends in the range chart

Step 2: Resolution/Discrimination

Adequate resolution or discrimination means that the measurement units (inches, tenths of inches, thousandths of inches,…) are sufficiently small enough to be able to "see" variation.

- Stratification on a range chart is a good indication that there is a problem with inadequate resolution.

- The number of stratified levels on the Range Chart is an indicator of the degree of the problem.

- Fewer "levels" means less adequate resolution:

- A rule of thumb: There should be approximately 5 levels of resolution between the control limits on the Range Chart and less than 25% of the ranges equal to zero to be considered adequate.

Step 3: Bias

Bias in a measurement study is a "shift" in the pattern on the X-bar chart between operators (i.e., the same part pattern is evident, but one operator reads consistently higher or lower than the others).

Step 4: Measurement Capability

Measurement capability is the comparison of Measurement Variation to Product Variation to determine whether the current measurement process can see part to part differences. More than 50% of the part measurements should be out-of-control to be considered marginally acceptable.

Step 5: Operator Bias

Operator Bias is the comparison of Between-Operator variation to Within-Operator variation. The difference from operator to operator should be less than the variation within operator

Step 6: Operator Inconsistency

Operator Inconsistency is the comparison of Within-Operator variation for a specific operator to the overall Within-Operator variation.

**Interpretation of the Session Window**:

What will the gage be used for?

If for Inspection, look at the

**%Tol **results.

If for Process Improvement, look at the

**% Study Var** results.

If for SPC, look at

**ndc** in addition to the % Study Var results.

The Total Gage R&R results are ideally less than 10%, but may be accepted up to 30% depending on the criticality of the characteristic.

ndc should be 5 or greater.

There is additional information that may be gleaned from the results, but these are the important results.