Download Activity-On-Node (A-O-N) Network Planning Technique in Construction Project Management and more Study notes Logic in PDF only on Docsity!
Dr. Adnan Fadhil Assist. Lect. Mustafa Ayad
Activity-On-Node (A-O-N) Network Planning Technique
What is the A-O-N Network (Precedence Diagram)? The Activity-on-Node, or Precedence Diagram uses similar logic to Activity-on-Arrow (A-O-A), but it is represented differently. With this technique, the activity is represented by a box or node, with the arrows showing logic relationship between boxes as shown below:
A-O-N Network Diagram Specification:
- There is no dummy activity.
- All the information that wanted to any activity is written on the box (node) area.
- The time overlapping problem for activities is solved by this technique.
- The delay time for activities can be solved without needing to return to the plan details. The Activity Early Start (E.S) It is the earliest time that an activity can start with.
Dr. Adnan Fadhil Assist. Lect. Mustafa Ayad The Activity Early Finish (E.F) It is the earliest time that an activity can finish with. E.F = E.S + Duration (D) The Activity Late Finish (L.F) It is the latest time that an activity can finish with. The Activity Late Start (L.S) It is the latest time that an activity can start with. L.S = L.F - Duration (D) The Activity Total Float (T.F) The float for an activity is the amount that its duration can slip without causing the project to be delayed. Any activity with a zero float is on the critical path (C.P). T.F = L.F – E.F (or) = L.S – E.S Critical path (C.P) is the path that has the longest duration where activities have zero float Examples of A-O-N Network Diagrams
Ex-1/ Find the project’s total duration. Use the following details to draw the A-O-N Network Diagram:
Activity A B C D G E F L I J M K Duration (weeks)
Following Activity
C,D G E F L I J M K K K ---
Solution:
Dr. Adnan Fadhil Assist. Lect. Mustafa Ayad
A-O-A Network Diagram:
Solution:
A-O-N Diagram:
Dr. Adnan Fadhil Assist. Lect. Mustafa Ayad
Relationships Among Activities A- Finish to Start (F.S) The activity (A) finished before starting of activity (B) by (n) period
B- Start to Start (S.S) The activity (A) start before (n) period of start for activity (B)
C- Start to Finish (S.F) The activity (A) start before (n) period of finish for activity (B)
D- Finish to Finish (F.F) The activity (A) finished before (n) period of finish of activity (B)
Homework
Dr. Adnan Fadhil Assist. Lect. Mustafa Ayad
Homework
