Activity sequencing Involves reviewing activities and determining dependencies Mandatory dependencies: inherent in the nature of the work; hard logic Discretionary dependencies: defined by the project team; soft logic External dependencies: involve relationships between project and non-project activities Examples of each type of dependency from your team projects? You must determine dependencies in order to use critical path analysis 2021/2/21 11
2021/2/21 11 Activity Sequencing ◼ Involves reviewing activities and determining dependencies ◼ Mandatory dependencies: inherent in the nature of the work; hard logic ◼ Discretionary dependencies: defined by the project team; soft logic ◼ External dependencies: involve relationships between project and non-project activities ◼ Examples of each type of dependency from your team projects? ◼ You must determine dependencies in order to use critical path analysis
Project Network Diagrams Project network diagrams are the preferred technique for showing activity sequencIng A project network diagram is a schematic display of the logical relationships among, or sequencing of project activities 2021/2/21
2021/2/21 12 Project Network Diagrams ◼ Project network diagrams are the preferred technique for showing activity sequencing ◼ A project network diagram is a schematic display of the logical relationships among, or sequencing of, project activities
Sample Activity-on-ArrOW(AOA) Network Diagram for Project X D=4 A=1 E=5 H=6 B=2 F=4 J=3 6 G=6 Note: Assume all durations are in days: A=1 means Activity a has a duration of 1 day. 2021/2/21
2021/2/21 13 Sample Activity-on-Arrow (AOA) Network Diagram for Project X
Arrow Diagramming method (ADM) Also called activity-on-arrow(aOa) project network diagrams Activities are represented by arrows Nodes or circles are the starting and ending points of activities Can only show finish-to-start dependencies 2021/2/21
2021/2/21 14 Arrow Diagramming Method (ADM) ◼ Also called activity-on-arrow (AOA) project network diagrams ◼ Activities are represented by arrows ◼ Nodes or circles are the starting and ending points of activities ◼ Can only show finish-to-start dependencies
Process for Creating AoA Diagrams Find all of the activities that start at node 1. draw their finish nodes and draw arrows between node 1 and those finish nodes Put the activity letter or name and duration estimate on the associated arrow 2. Continuing drawing the network diagram, working from left to right. Look for bursts and merges. Bursts occur when a single node is followed by two or more activities. a merge occurs when two or more nodes precede a single node 3. Continue drawing the project network diagram until all activities are included on the diagram that have dependencies 4. as a rule of thumb all arrowheads should face toward the right and no arrows should cross on an aOa network diagram 2021/2/21
2021/2/21 15 Process for Creating AOA Diagrams 1. Find all of the activities that start at node 1. Draw their finish nodes and draw arrows between node 1 and those finish nodes. Put the activity letter or name and duration estimate on the associated arrow 2. Continuing drawing the network diagram, working from left to right. Look for bursts and merges. Bursts occur when a single node is followed by two or more activities. A merge occurs when two or more nodes precede a single node 3. Continue drawing the project network diagram until all activities are included on the diagram that have dependencies 4. As a rule of thumb, all arrowheads should face toward the right, and no arrows should cross on an AOA network diagram