In Herzberg's two-factor theory, which of the following is considered not to be a hygiene factor?

In Herzberg's two-factor theory, hygiene factors are elements that, while important, do not lead to higher levels of motivation or satisfaction but can cause dissatisfaction if not adequately addressed. These typically include aspects such as company policies, salary, job security, and the quality of supervision.

A sense of achievement, on the other hand, is categorized as a motivator factor. Motivator factors are aspects that contribute to job satisfaction and encourage employees to perform better. They include factors like opportunities for personal growth, recognition, responsibility, and a sense of achievement. When individuals feel a sense of achievement in their roles, it can lead to increased motivation and job satisfaction, fuelling their desire to excel professionally.

Therefore, the correct choice identifies a sense of achievement as not being a hygiene factor but rather a motivator that actively contributes to an employee's satisfaction and performance.