This is how it works. When a new skill is added to an existing job, the employee can earn a pay increase by mastering the new skill. Several methods for defining individual skills exist: direct observation of incumbents, testing, and measurable results. Instead of detailed job description, "person" and "skill block" descriptions are developed. Skill block descriptions are priced much as in job evaluation. To date, most skill-based pay systems focus on nonexempt manufacturing workers and others who engage in routine high-volume jobs. The more a job involves skills that are relatively easy to identify in terms of desired performance outcomes, the better the fit of the pay model.