For most organizations, the two primary variables that define their IS Security challenges are:

It has a simplicity in that it uses straight lines for the three primary variables: pressure, temperature and potential temperature.

The primary variable was whether 2nd Battalion had to operate alone or had reinforcements from one of the other battalions.

If the primary variable is mass fraction (, given, for example, in ), then the equation changes to:

Curriculum-based measurement uses rate and reading performance as the primary variable in determining reading levels.

For multivariate analyses, our primary independent variables were smoking intensity and time since smoking cessation.

But experts in the field agree that affluence is the primary variable.

Three primary variables are used in the optimality model: decisions, currency, and constraints.

The primary independent variable was "time".

There are three primary variables in blade design: curve, face angle, and toe.