An Integrated Approach for Shift Scheduling and Rostering Problems with Break Times for Inbound Call Centers

Table 3

List of CP constraints used for benchmark instances.

Constraint on [8]	Definition of Constraint	Our Constraint Structure
1	An employee cannot be assigned more than one shift on a single day	Cumulative function
2	A minimum amount of rest is required after each shift	Cumulative function
3	The maximum numbers of shifts of each type that can be assigned to employees	Cumulative function
4	Minimum and maximum work time	Presence (Logical constraints)
5	Maximum consecutive shifts	Count function
6	Minimum consecutive shifts	Count function
7	Minimum consecutive days off	Count function
8	Maximum number of weekends	Presence (Logical constraints)
9	Days-off	Presence (Logical constraints)
10	Cover requirements	Cumulative function