Lecture 3 Flashcards
Project network is a flow chart that…
Depicts the sequence, interdependencies and start of finish times of project activities
Shows critical path
Aspects to consider when project planning (6)
Methods used to place the work
Skills needed for the work
Crafts involved
Critical activities
Administrative actions
Deliverables
Scheduling is used to establish: (6)
Timing objectives
Sequence of activities
Cash flow requirements
Benchmarks
Basis for performance
Early warning system
What logical decisions can scheduling help us make? (4)
Continuation
Acceleration
Redirection
Changes
What are milestone schedules
Can be at the management level or project milestones
What types of bar charts are there
Plan focus
Performance focus
Plan focus bar chart
Created on a time line to show the schedule for starting, execution and completing each project item
Work/performance focus bar chart
Graphical representation of actual performance towards completion
Shows percent complete of each item instead of time scale
Steps of project scheduling (4)
Overall sequence of work
Sequential time diagram indicating order
Detailed planning and breakdown (resources, manpower needed, etc.)
Detailed and expanded project model
How do you choose activity duration?
Consult field personal
Depends on productivity, resources available, crew size
Determine minimum duration possible and how long an activity can be delayed without impacting minimum project length
What does ES stand for
Early start - earliest time a particular project can begin
Bar chart pros
Easy to read
Shows major work activities
Clearly and quickly shows project progress
Bar chart cons
Difficult to produce complex schedules
Typically no relationships shown
What shape do we want of a graph showing resources per day/period
Relatively steady throughout project duration, ramps up at beginning and ramps down at the end
What do we want to avoid in cumulative s-curve graph?
Steep areas
Three ways to show critical path method CPN
Activity on arrows network
Activity on nodes network
Planning/project evaluation and review technique networks
Activity
An element of the project that requires time
Merge activity
An activity that depends on two or more preceding activities
Parallel (concurrent) activities
Activities that can occur independently, and if desired at different times
Path
Sequence of dependent, connected activities
Critical path
The shortest expected time in which the entire project can be completed
How to denote activity for an AOA diagram
The numbers on the nodes immediately preceding and coming after the activity
AOA Mistake
Activities can’t both begin and end at the same nodes because they will have the same numbers for the identifier. Use a dummy node for one activity so that they have different identifiers
Predecessor
A predecessor comes before a given activity
Successors
Successors are the activities following a given activity
Forward pass
Earliest times:
- ES early start, how soon can the activity start
- EF early finish, how soon can the activity finish
Backward pass
Latest times
- LS late start, how late can it start
-LF late finish, how late can it finish
Slack/Float
How long an activity can be delayed
Total float
Total amount of time an activity can be delayed without causing an extension of the project duration
TF = LF - EF
Free Float
Amount of time an activity can be delayed without affecting any subsequent activities’ early start times
Interfering Float
Amount of total float utilized that interferes with the following activities
INTF = TF - FF
Hammock activity
An activity that spans over a segment of a project
Duration is determined after the network plan is drawn
Used to aggregate sections of the project
NTP
Notice to proceed
Pseudo dummy to show start of project when there’s more than one activity with no dependencies
PC
Project completion
Pseudo dummy for end of project when there is more than one end point
Optimistic duration
All conditions are favorable
Most likely duration
What the most likely duration is
Pessimistic duration
All conditions are unfavourable
Quality assurance vs control
Assurance is evaluating as a part of the project is ongoing to make sure once it’s done it will meet standards while control is evaluating a part of the project once it is completed to make sure it meets standards
