a. be capable, as a whole, of providing comprehensive preventive assistance to the systematic health, safety and environmental activities; see Section 3-3 of the Working Environment Act and Chapter 14 of the Regulations concerning Organisation, Management and Employee Participation; b. have a quality assurance system that ensures that the occupational health service assists the employer as described in Chapter 13 of the Regulations concerning Organisation, Management and Employee Participation in a satisfactory manner; c. have a quality assurance system that ensures competence development for the occupational health service personnel; d. have professional personnel corresponding to at least three full-time equivalents. Each area of professional expertise (occupational medicine, occupational hygiene, ergonomics and psychosocial-organisational) must be covered by at least 30% of a full-time equivalent. e. have professional personnel corresponding to at least three full-time equivalents. Each area of professional expertise (occupational medicine, occupational hygiene, ergonomics and psychosocial-organisational) must be covered by at least 30% of a full-time equivalent.