Chapter 5 Flashcards
(23 cards)
Estimated resources needed for activities
Resources include?
- people
- materials
- equipment
- facilities
Influence on duration of activities?
- Availability of resources
- types of resources
- sufficient quantities of resources for activity durations
- potential conflicts / other projects may cause
Estimated duration of an activity?
Estimated total relapsed time for low long an activity will take from start to finish (include waiting time)
shown in lower right hand corner of box
3 time estimates?
For projects will high degree of uncertainty about estimated duration
1. Optimistic estimate
2. Pessimistic est
3. Most likely est
Establish project start & completion time ?
- define overall window for project completion
- sponsor / customer often stated required completion time in project charter , RFP , contract
- may not want to commit to a certain date
- project not to start till customer approved contract
- delay in contract signing may impact start
- set finish time as no. Of days from P start
Prior activities for schedules development?
- est duration of each activity
- est overal window of time for P
once est determine whether the P can be finished by required finished time
Calculate EF (earliest finish) ?
EF= ES + estimated duration
Are calculated by moving forward
Earliest start ?
Earliest an activity can begin
Put at top left of block
Earliest finish ?
Earliest an activity can be completed
Put at top right of block
Latest finish time (LF) ?
Latest time which a specific activity must be completed for project to be finished by its required completion time
Put at bottom right block
Latest start time (LS) ?
Latest time which a specific activity must be started for the project to be finished by the required completion time
Put at under left of block
Calculate latest start time (LS) ?
LS= LF - est duration
Are calculated by moving backwards
Calculate Total slack (total float) ?
TS= LF- EF
OR
TS= ES-EF
What is negative slack ?
- lack of slack over entire project
- amount of time an activity must be accelerated
What is positive slack ?
- max amount of time the activities on a particular path can be delayed without jeopardising on time completion
What is the critical path ?
Any path of activities with 0 or negative slack
Longest path with lowest total slack
Free slack ? ( free float ) **FS ?
Amount of time a specific activity can be delayed without delaying ES
relative difference between values of TS for activities entering into same activity (only when 2 or more activities enter into same activity)
**FS is a relative difference between values for TS (always +)
Calculating FS?
Fine lowest values of total slack for all activities entering into a specific activity then :
- SUBTRACT value from values of TS for other activities entering into that same activity
Project control process ?
- meetings occur regularly
- gather data on actual performance
- record changes
- monitor progress
Project control ?
- regularly gathering data on actual project performance
- comparing actual performance to planned performance
- taking corrective action immediately is actual performance is behind planned performance
- must occur regularly throughout project
Reporting period of project control process ?
Time interval at which actual project performance will be compared to planned performance
May be daily , weekly , biweekly
During reporting period what data needs to be collected?
- Data in actual performance
- actual time that activities were started /finished
- actual costs expended &commited
- earned value if the work completed
- Info on any changes to project scope, SCHED & budget
- these changes must be initiated by customer or project team or result of unanticipated occurrence
AF (actual finish) ?
Time at which a specific activity is actually completed
