•Variable is in theory infinitely variable, e.g. the slider switch could be positioned in an

infinite number of positions.
•For variables, we measure with a certain resolution. If that resolution is too coarse

for the variation we are trying to measure, then the data can be ‘granular’. This is

undesirable statistically. The resolution of the measurement system can be verified

by conducting a Gauge R&R Study (see GOAL Variable Gauge R&R training

material).
•An attribute can only be good or bad, pass or fail. This is similar to a binary system.
•Much of mechanical visual quality is based on attribute data.
•Process Capability can only be applied to variable data.