Project Time Management
Project time management involved six processes; Activity definition, Activity sequencing, Activity resource estimating, Activity duration estimating, Schedule development and Schedule control.
First and foremost, Activity definition; involves developing a more detailed WBS and supporting explanations to understand all the work to be done so you can develop realistic cost and duration estimates. An activity list is a tabulation of activities to be included on a project schedule that includes:
The activity name
An activity identifier or number
A brief description of the activity
Activity attributes provide more information such as predecessors, successors, logical relationships, leads and lags, resource requirements, constraints, imposed dates, and assumptions related to the activity. And a milestone is a significant event that normally has no duration.
Activity Sequencing; involves reviewing activities and determining dependencies. You must determine dependencies in order to use critical path analysis. Network diagrams are the preferred technique for showing activity sequencing. A network diagram is a schematic display of the logical relationships among, or sequencing of, project activities. And two main formats are the arrow and precedence diagramming methods.
Activity Resource estimating; before estimating activity durations you must have a good idea of the quantity and type of resources that will be assigned to each activity. A resource breakdown structure is a hierarchical structure that identifies the project’s resources by category and type. Duration includes the actual amount of time worked on an activity plus elapsed time. Effort is the number of workdays or work hours required to complete a task.
Instead of providing activity estimates as a discrete number, such as four weeks, it’s often helpful to create a three-point estimate. An estimate that includes an optimistic, most likely, and pessimistic estimate, such as three weeks for the optimistic, four weeks for the most likely, and five weeks for the pessimistic estimate.
Schedule Development ultimate goal is to create a realistic project schedule that provides a basis for monitoring project progress for the time dimension of the project. Important tools and techniques include Gantt charts, critical path analysis, critical chain scheduling, and PERT analysis. Gantt charts provide a standard format for displaying project schedule information by listing project activities and their corresponding start and finish dates in a calendar format.
CPM (Critical Path Method) is a network diagramming technique used to predict total project duration. A critical path for a project is the series of activities that determines the earliest time by which the project can be completed. The critical path is the longest path through the network diagram and has the least amount of slack or float. Slack or float is the amount of time an activity may be delayed without delaying a succeeding activity or the project finish date.
Free slack or free float is the amount of time an activity can be delayed without delaying the early start of any immediately following activities. Total slack or total float is the amount of time an activity may be delayed from its early start without delaying the planned project finish date. A forward pass through the network diagram determines the early start and finish dates. A backward pass determines the late start and finish dates
Critical chain scheduling is a method of scheduling that considers limited resources when creating a project schedule and includes buffers to protect the project completion date. Uses the Theory of Constraints (TOC). A management philosophy developed by Eliyahu M. Goldratt and introduced in his book The Goal. A buffer is additional time to complete a task. Murphy’s Law states that if something can go wrong, it will. Parkinson’s Law states that work expands to fill the time allowed.
Program Evaluation and Review Technique (PERT) is a network analysis technique used to estimate project duration when there is a high degree of uncertainty about the individual activity duration estimates. PERT uses probabilistic time estimates. The formula:
PERT weighted average =
optimistic time + 4X most likely time + pessimistic time
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Schedule Control is performing reality checks on schedules and allow for contingencies. Don’t plan for everyone to work at 100% capacity all the time and hold progress meetings with stakeholders and be clear and honest in communicating schedule issues.
Using Software to Assist in Time Management Software for facilitating communications helps people exchange schedule-related information. Decision support models help analyze trade-offs that can be made. Project management software can help in various time management areas.