A Hybrid Approach for Project Crashing Optimization Strategy with Risk Consideration: A Case Study for an EPC Project

Table 2

Input data for case analysis.

Activity	Subsequent activity	Duration (days)			Average time (days); t = (to+tm+tp)/3	Crash time constraint (t - o) (days)	Crash time constraint (m -o) (days)	Crash time constraint (p -o) (days)	Fixed cost (1000USD)
		o	m	p
J (Site Preparation)	B	57	69	76	67	10	12	19	58
A (Design and Subcontracting)	B	107	119	131	119	12	12	24	2,453
B (Piling)	C	95	117	127	113	18	22	32	605
C (Foundation)	D	73	89	97	86	13	16	24	384
D (RC 2F)	E	59	73	79	71	11	14	20	1,500
E (RC 3F)	F, G	59	72	78	70	11	13	19	1,500
F (RC 4F)	H	58	72	79	70	12	14	21	1,500
G (Arch. 2F)	H	79	92	98	90	11	13	19	3,339
H (Arch. 3F)	I	59	72	78	70	11	13	19	3,339
I (Arch. 4F to shelter &Outside)	- (FINISH)	326	398	434	386	60	72	108	3,339

Note: o: optimistic; m: most likely; p: pessimistic.