For the purposes of this Directive, the following definitions apply:
(a)
‘work schedule’ means the schedule determining the hours and days on which performance of work starts and ends;
(b)
‘reference hours and days’ means time slots in specified days during which work can take place at the request of the employer;
(c)
‘work pattern’ means the form of organisation of the working time and its distribution according to a certain pattern determined by the employer.