An Adapted Firefly Algorithm for Product Development Project Scheduling with Fuzzy Activity Duration

Table 3

Activities’ start times and finish times.

Activity number	Fuzzy start time	Fuzzy finish time
1	(0, 0, 0, 0)	(0, 0, 0, 0)
2	(0, 0, 0, 0)	(4, 6, 9, 12)
3	(4, 6, 9, 12)	(11, 15, 20, 26)
4	(11, 15, 20, 26)	(17, 23, 30, 38)
5	(4, 6, 9, 12)	(11, 14, 19, 23)
6	(11, 15, 20, 26)	(13, 18, 25, 32)
7	(17, 23, 30, 38)	(22, 30, 38, 48)
8	(22, 30, 38, 48)	(31, 42, 52, 64)
9	(31, 42, 52, 64)	(31, 42, 52, 64)