Columns: 'Activity' column and 'depends on' column
What is it for: Shows all the activities of an activity network and which activities each of them depend on.
Used to draw an activity network
What are they: Nodes are used between activities to mark the start or end of an activity
Source node: Always 0, at the start of an activity network
Sink node: At the end of an activity network
Remember: An activity can never start with a larger node and finish at a smaller node
Early and late event times
Latest start time: Perform a forward pass. Always check each route to a node and select the longest route.
Earliest finish time: Perform a backward pass. Always check each route to a node and select the shortest route.
Use the nodes to write the early and late times.
Total float: Latest finish time - activity duration - earliest start time
Critical activites: Always have the same early and late event time
Critical path: The path formed by the critical activities
Critical time: The duration of the critical path
Lower bound of workers: Total time for all activities / critical time
What are they: These are arcs in an activity network with no duration. Always shown by a dotted line
When are they needed: When there are activities with complex dependance (many situtations). Most common - When two activities from the same node also need to end at the same node.
And when an activity depends upon two activities from different nodes that already have activities dependant upon them.
AKA: Gantt charts
Method: Always put critical activities on the top row. Put all other activities on seperate rows and draw their duration in a solid box with their total float extended as a dotted line.
Scheduling diagram: A special gantt chart that assigns workers to activites. Need to present lower bound of workers on the left, each with their own row. Arrange activities, moving them within their total float to use the minimal amount of workers.