Table 3.

The features of the INRC2010 datasets.

Track	Type	Instance	Nurses	Skills	Shifts	Contracts	Unwanted pattern	Shift off	Day off	Weekend	Time period
Sprint	Early	01–10	10	1	4	4	3	✓	✓	2	1-01-2010 to 28-01-2010
	Hidden	01-02	10	1	3	3	4	✓	✓	2	1-06-2010 to 28-06-2010
		03, 05, 08	10	1	4	3	8	✓	✓	2	1-06-2010 to 28-06-2010
		04, 09	10	1	4	3	8	✓	✓	2	1-06-2010 to 28-06-2010
		06, 07	10	1	3	3	4	✓	✓	2	1-01-2010 to 28-01-2010
		10	10	1	4	3	8	✓	✓	2	1-01-2010 to 28-01-2010
	Late	01, 03–05	10	1	4	3	8	✓	✓	2	1-01-2010 to 28-01-2010
		02	10	1	3	3	4	✓	✓	2	1-01-2010 to 28-01-2010
		06, 07, 10	10	1	4	3	0	✓	✓	2	1-01-2010 to 28-01-2010
		08	10	1	4	3	0	×	×	2	1-01-2010 to 28-01-2010
		09	10	1	4	3	0	×	×	2, 3	1-01-2010 to 28-01-2010
	Hint	01, 03	10	1	4	3	8	✓	✓	2	1-01-2010 to 28-01-2010
		02	10	1	4	3	0	✓	✓	2	1-01-2010 to 28-01-2010
Medium	Early	01–05	31	1	4	4	0	✓	✓	2	1-01-2010 to 28-01-2010
	Hidden	01–04	30	2	5	4	9	×	×	2	1-06-2010 to 28-06-2010
		05	30	2	5	4	9	×	×	2	1-06-2010 to 28-06-2010
	Late	01	30	1	4	4	7	✓	✓	2	1-01-2010 to 28-01-2010
		02, 04	30	1	4	3	7	✓	✓	2	1-01-2010 to 28-01-2010
		03	30	1	4	4	0	✓	✓	2	1-01-2010 to 28-01-2010
		05	30	2	5	4	7	✓	✓	2	1-01-2010 to 28-01-2010
	Hint	01, 03	30	1	4	4	7	✓	✓	2	1-01-2010 to 28-01-2010
		02	30	1	4	4	7	✓	✓	2	1-01-2010 to 28-01-2010
Long	Early	01–05	49	2	5	3	3	✓	✓	2	1-01-2010 to 28-01-2010
	Hidden	01–04	50	2	5	3	9	×	×	2, 3	1-06-2010 to 28-06-2010
		05	50	2	5	3	9	×	×	2, 3	1-06-2010 to 28-06-2010
	Late	01, 03, 05	50	2	5	3	9	×	×	2, 3	1-01-2010 to 28-01-2010
		02, 04	50	2	5	4	9	×	×	2, 3	1-01-2010 to 28-01-2010
	Hint	01	50	2	5	3	9	×	×	2, 3	1-01-2010 to 28-01-2010
		02, 03	50	2	5	3	7	×	×	2	1-01-2010 to 28-01-2010