Frederick Herzberg found that satisfaction and dissatisfaction come from different sources — so fixing what people complain about does not motivate them, it just stops them complaining.
Hygiene factors are pay, conditions, company policy, supervision, job security and relationships. Get them wrong and people are actively dissatisfied. Get them right and people are simply *not dissatisfied*, which is not the same as motivated.
Motivators are achievement, recognition, the work itself, responsibility and advancement. These are what actually produce satisfaction and effort.
This is the counter-intuitive bit and the reason the theory is examined so often. Pay is a hygiene factor. Fixing bad pay removes a problem; it does not create motivation.
Herzberg's prescription follows directly: if motivators live in the work itself, then redesign the work. Job enrichment means giving people more responsibility and control over a complete piece of work — as opposed to job enlargement, which is simply more tasks of the same kind, and does little.
The mark is usually in the distinction: hygiene prevents dissatisfaction, motivators create satisfaction. Say it explicitly, then apply.