J. Smith (Project Manager for Print Software Pty Ltd) wants you to prepare a project network. Calculate the early, late and slack activity times. Determine the planned project duration and identify the critical path. His assistant has collected the following information for the Colour Printer Driver's Software Project:

ID	Description	Predecessor	Time
A	External specifications	None	8
B	Review design features	A	2
C	Document new features	A	3
D	Write software	A	60
E	Program and test	B	60
F	Edit and publish notes	C	2
G	Review manual	D	2
H	Alpha site	E, F	20
I	Print manual	G	10
J	Beta site	H, I	10
K	Manufacture	J	12
L	Release and ship	K	3