Lecture 9 Flashcards
Developing a Schedule
1. Define the ____, objectives, and desired outcomes
– Develop a Basis of Schedule document
2. Define ________ (start with WBS)
3. Logically ______ the activities
4. Assign __________
5. Include any outside _________
6. Establish activity _____/_____ times
7. Assign _________ and _____ to activities
8. Review schedule with stakeholders
goals, activities, order, durations, constraints, start/finish, resources, costs
Arrow diagram method (___)/Activity on Arrow (___)
Precedence diagram method (___)/Activity on Node (___)
ADM/AOA, PDM/AON
Critical Path Method (CPM)
* The critical path method (CPM) is a step-by-step project management ________ for project planning that defines
________ and non-critical tasks
* Goal: prevent time-frame __________ and process bottlenecks.
* Application: projects consisting of numerous activities that interact in a complex manner.
* Uses assigned activity __________ and _________ to calculate
schedule characteristics
technique, critical, problems, durations, constraints
Critical Path:
– Chain of critical activities that controls overall _________ _____________
–____________ duration path in the network
project completion, longest
CPM can help identify:
* ________ activities
* Project’s total _________
critical, duration
- Reducing project __________ can only be accomplished through __________ of length of critical path.
– Re-arranging critical activities
– Reducing critical activity durations
duration, reduction
Arrow Diagram Method (ADM)
* Arrows = _________
– Consume time and resources
– Performance of the work
– “i” node at beginning; “j” node at end
* Nodes = _________
– No associated duration or resources
– Milestones
activities, events
Precedence Diagram Method (PDM)
* Nodes = ________
– Consume time and resources
– Performance of the work
* Lines (arrows) = ________ ______
– Show network logic
– Can include time (lag or lead time)
activities, activity links
Activity Durations
* Company _________ enables accurate time estimation
* The basic time unit commonly used is a ________ _____ though other units might be appropriate (e.g., Week, Month,
Hour)
experience, working day
Sources of Information for Time
Estimates
* __________ production rates
– For equipment intensive activities
* _________ production rates and unit costs
– Depends on how the activity is crewed
* Informal determination
– When experienced constructors are available
equipment, labor
Milestone
* A milestone activity has _____ _________
identifies an important intermediate point in
time for the project
zero duration
CPM Activity Times
* ______ _______ (ES) - The earliest time an activity can possibly ____, allowing time for the completion of ___________ activities
early start, start, predecessor
CPM Activity Times
_____ ________ (EF) - Earliest time an activity can
be finished and is determined by adding
the activity’s ________ to its early start
time.
Equation: ___=____+_______
Early Finish, EF=ES+Duration
CPM Activity Times
_____ _______ (LS) - Latest time an activity
can possibly start, allowing time for the
completion of ___________ activities
Equation: ___=___ -______
late start, predecessor, LS = LF - duration
CPM Activity TImes
____ ______ (LF) - Latest time an activity
can be __________ and is determined by
adding the activity’s duration to its
early start time
late finish, finished
_____ ______ (TF) - The maximum time that an activity’s actual completion date can _______ beyond its earliest finish time and not _____ the entire project
TF =?
total float, extend, delay, LS-ES
____ _____ (FF) - The maximum time by which an activity’s actual completion date can exceed its earliest finish date and not impact either the _______ project completion or the times of any ________ activities
Equation:
free float, overall, subsequent, FF = (early event time of activity’s ending event) - EF
____ ______ - The amount of time an activity can
be delayed before pushing the next activity
______ ______- The amount of time an activity can be delayed before delaying the completion of the project.
free float, total float
_____ ______ is a shared resource
_____ ______ is unique to a specific activity
total float, free float
Forward Pass - to calculate ___, ___, and ______ _________
ES, EF, and project duration
Backward Pass - to calculate ___, and ___
LF, LS
Critical path is along those activities with ____ ______
zero float
Relationships: ____________ (FS), ___________ (FF), ___________(SS), ___________(SF)
finish to start, finish to finish, start to start, start to finish,
Lag is a _____ of successor
delay
Lead is an _____________ of sucessor
acceleration
Lag Times
* Lag time assigns a _______ between one activity and another
* Lag time is used for several reasons
– A ___________ requirement such as concrete setting
– A time _______ such as delaying the start of
electrical rough-in in a partition until X days after start of partition framing
delay, physical, buffer
Three phase CPM procedure:
_____________ - Determining what must be done, how it is to be done and the order of execution
_____________ - Analysis of the plan to develop useful management information
_____________ - Using the management information to identify problems and offer solutions
planning, scheduling, controlling
