The Frederick Herzberg reference article from the English Wikipedia on 24-Apr-2004
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Frederick Herzberg

Helping orphans the way you would do it
Frederick Herzberg (1923 - 2000) proposed the Two Factor theory of human motivation. According to his theory people were influenced by two factors. Satisfaction and psychological growth was a factor of motivation factors. Dissatisfaction was a result of hygiene factors. Essentially, hygiene factors were needed to ensure an employee was not dissatisfied. In order to motivate an employee into higher performance motivation factors were needed.

Hygiene Factors include

Motivation Factors Include The combination of hygiene and motivation factors can result in four conditions.

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Also see Hawthorne effect - which throws light on the diffulties of measuring motivation