SAP PS Question:

Answer #1
Relationship basically denotes how activities in a
networkorder are related to each other.They can be
classified into 4 categories - SS (Start-Start), SF(Start-
Finish), FF (Finish-Finish), FS (Finish - Start).

For 2 activities say A and B

SS -->> Both A and B start together
SF -->> Start of A coincides with finish of B and so on.

We can also specify the time gap between which these
relationships work. Say in an SS relationship, there can be
a 10 minutes gap between start of A and B and so on.

Answer #2
linking the nework activities to each other for flow of work in sequence order like SS(Start- Start) SF(Start-finish) FF(Finish-Finish) and FS(Finish-Start) and it depends on conditions also