Prediction is best defined as a single numerical estimate of HR requirements associated with a specific time horizon and set of assumptions.

Numerical Estimate

A quantified approximation or prediction about a certain quantity or outcome.

HR Requirements

The specific needs or qualifications an organization requires from its human resources including skills, experience, and education for employment.

Time Horizon

The length of time over which an investment, project, or strategy is planned or expected to occur or be effective.