Subsequently, the SAPS management proposed the convening of a workshop under the aegis of the SSSBC to address the concerns of the trade unions about the implementation of the new shiftwork system. However, it has always considered that the decision to introduce the new system fell within the scope of the pre-authority of managers, authorised by Agreement 5/2002. Article 7 of Agreement 5/2002 provides that the settlement of disputes is as follows: on 25 July 2005, the management of SAPS sent a letter to the trade unions and the SSSBC, in which they consider that the modification of the shiftwork system does not constitute a unilateral modification of the terms and conditions of employment, since Agreement 5/2002 provides for such a postponement. Article 1 of Agreement 5/2002 regulates ordinary working time. Bruinders that clause 1 of Agreement 5/2002 explicitly confers a right to 8-hour or 12-hour shifts at the discretion and comfort of the Commissioner. I have no proof of this and no such argument has been put forward to support the assertion that there is a tacit time limit that confers the right to work a 12-hour shift. Nor do the rules provide for such a contractual period. In short, it is not a duration of the employment contract that workers who work in 12-hour shifts always have the right to do so. In the absence of explicit, tacit or tacit contractual rights to this effect, workers do not have the legitimate right to maintain their working hours unchanged for all periods. . . .