6.6 develop schedule Flashcards
schedule network analysis
technique that generates the project schedule model. employs analytical techniques - CPM, CCM(Critical chain method), what if analysis, and resource optimisation techniques to calculate early and late start and finish dates
Critical path method
Method used to estimate the minimum project duration and determine the amount of scheduling flexibility on the logical network path within the schedule model.
Critical path
Sequence of activities that represent longest path through a project, which determines shortest possible project duration
What are the inputs to schedule development
Schedule management plan Activity list Activity attributes Project schedule network diagrams Activity resource requirements Resource calendars Activity duration estimates Project scope statement Risk register Project staff assignment Resaws breakdown structure Enterprise environmental factors Organisational process assets
Develop schedule - tools and techniques
Schedule network analysis Critical path method Critical chain method Resource optimisation techniques Resource smoothing
Critical path method
Critical path method is the method used to estimate the minimum project duration and determine the amount of scheduling flexibility on the logical network parts within the schedule model.
What calculations are done in the critical path method?
It calculates really start early finish late start late finish dates for all activities by doing a forward and back word pass analysis through the network schedule without regard for any resource constraints
What is the main purpose of critical path method
The critical path method is used to calculate the amount of scheduling flexibility on the logical network paths within the schedule model
What is ‘total float’
On any network schedule the schedule flexibility is measured by the amount of time that a schedule activity can be delayed or extended from its early start date without delaying the project finish date or violating a schedule constraint, and is termed ‘total float’
As implemented using PDM (precedence diagramming method) method, what are the possible float values in a critical path
Critical path could have positive, negative or zero float
When do you get a positive total float in critical path method?
Positive total float is caused when the backward pass is calculated from the schedule constraint that is later than the early finish date that has been calculated using the forward pass calculation.
When do we get negative total float
Negative total float is caused when a constraint on the late dates is violated by duration and logic.
How do we produce network paths with zero or positive total float?
Adjusting activity durations with more resources or less scope
Checking if logical relationship can be discretionary
Leads and lags
What is free float
Amount of time that a scheduled activity can be delayed without delaying the early start date of any successor or violating a schedule constraint
What is critical chain method(CCM)
Is a schedule method that allows the project team to place buffers on any project schedule path to account for limited resources and project uncertainties
How buffers are used in critical chain method
It uses activities with durations without safety margin, logical relationships, and resources availability with statistically determined buffers composed of the aggregated safety margins of activities at specified points on the project schedule path to account for limited resources and project uncertainties
What is critical chain
Resource constraint critical path is known as the critical chain
What are the resource optimisation techniques?
Resource levelling
Resource Smoothing
Difference between Resource levelling and Resource Smoothing
Resource levelling gives priority to ensure that the resources do not get over allocated to Tasks. This may result in critical path to get extended.
Resource Smoothing on the other hand only optimised resource usage to the point where critical path is not impacted.
What are the modelling techniques?
What if analysis
Simulation techniques
What is what-if analysis?
It is the process of evaluating scenarios in order to predict their effects on the project objectives.
A schedule network analysis is done on the schedule to compute the different scenarios such as delaying a major component delivery, extending a specific engineering component, or introducing external factors such as strike or a change in the permit process
what is simulation
This involves calculating different sets of activity assumption, usually using probability distributions constructed from the three point estimates to account for uncertainty. The most common simulation technique is monte Carlso analysis, in which a distribution of possible activity durations is defined for each activity and used to calculate a distribution of possible outcomes for the total project
What is schedule compression?
Is a technique used to shorten the project duration without reducing the project scope, in order to meet schedule constraints, imposed dates, or other schedule objectives.
what are the schedule compession tecnuques?
1) Crashing- increase resources, overpayments, paying to expedite delivery to activities on the critical path.
2) Fast tracking - activities or phases normally done in sequence are done in parallel for atleast a portion of their duration.
