The activities and stages for the house construction project, starting from the preparatory work/site work, to the fencing work, including duration, optimistic and pessimistic estimates (a, b) and predecessors.

Table 1: The activities and stages for the house construction project, starting from the preparatory work/site work, to the fencing work, including duration, optimistic and pessimistic estimates (a, b) and predecessors.

S/N	Activity	i - j	Description	Duration (in days)	a, b (in days)	Predecessor
1	A	2-Jan	Site work	5	3, 7	-
2	B	3-Feb	Excavation work	7	4, 10	A
3	C	4-Mar	Foundation work	12	10, 14	B
4	D	6-Apr	Column structure work	14	13, 15	C
5	E	5-Apr	Sloof works	8	5, 11	C
6	F	8-May	Wall & Frame works	14	12, 16	E
7	G	7-Jun	Roof trust works	12	8, 16	D
8	H	9-Jul	Roof (Ceiling & Tiles) works	19	12, 20	G
9	I	10-Sep	Sanitary works and Electrical installation	22	14, 24	F, H
10	J	11-Sep	Plastering works	27	24, 30	F, H
11	K	11-Oct	Floor works	20	16, 30	I
12	L	12-Aug	Installation works (lamps, glass, doors, etc.)	17	16, 24	F
13	M	13-Nov	Painting works	32	30, 24	J, K
14	N	13-Dec	Fencing works	12	10, 14	L
15	O	13-14	Complementary works	8	6, 10	M, N