Hi

I have typical question on Network diagram pertaining to the start point and calculationon of Early start for subsequent activity. Generally I start first activity with ES=0 and add the duration to find the early finish. For example A=1 ---> B =3, So I use ES=0 & EF=1 for A activity and ES=1 and EF=4 for B activity. This is generally I follow but in some cases like HeadFirst Labs they start with 1.