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

Table 10

Information on test instances and details of Model 1.

Ins.	Operator demand per period				Total number of the opened shifts		Obj.	Time (s)	No. of const.	No. of variab.
	Min	Ave.	Max
1	0	3.54	9	10	23	100	9,360	4.62	952	1,373
2	1	5.51	13	10	26	147	10,806	4.97	952	1,373
3	1	7.58	18	10	27	196	11,625	4.27	952	1,373
4	3	10.82	23	15	26	274	12,282	3.97	952	1,373
5	2	11.40	26	15	28	299	14,121	4.30	952	1,373
6	2	11.40	26	20	27	299	13,821	4.68	952	1,373
7	3	14.07	32	30	27	367	14,973	4.62	952	1,373
8	3	14.07	32	30	27	367	14,973	4.58	952	1,373
9	4	20.99	47	40	27	546	18,201	4.07	952	1,373
10	4	22.80	52	40	27	598	19,542	4.07	952	1,373
11	5	26.66	60	40	27	701	21,648	4.62	952	1,373

The results in bold are proved to be optimal.