The employer shall, at least once a year, or when one of the parties so requires, discuss with the elected representatives the use of part-time, temporary employment, hiring, independent contractors and purchases of services from other undertakings that have consequences on staffing. Among other things, the discussion must include the basis, scope and consequences for the working environment. When hiring from temporary work agencies, the manner in which the requirement for equal treatment will be practiced shall also be discussed, cf. section 14-12 a.