s-curve
DESCRIPTION
constructionTRANSCRIPT
By: Rodel dC. Natividad, Jr.
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"A display of cumulative costs, labor hours or other quantities plotted against time. The name derives from the S-like shape of the curve, flatter at the beginning and end and steeper in the middle, which is typical of most projects. The beginning represents a slow, deliberate but accelerating start, while the end represents a deceleration as the work runs out.R. Max Wideman
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SAMPLE S-CURVE
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Man Hours versus Time S-curve Costs versus Time S-curve Baseline S-curve Actual S-curve Target S-curve Value and Percentage S-curves
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The Man Hours versus Time S-curve is appropriate for projects that are labor intensive. It shows cumulative man hours expended over time for the duration of the project. As man-hours are a product of manpower and working hours, these may be adjusted together or individually in an attempt to keep the project on schedule. Projects may require additional man-hours to finish on time due to low productivity, delays and disruptions, rework, variations, etc.
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Ordinate Resources i.e. (Manpower) Manpower vs Time S-Curve
Abscissa Constraint i.e. (Time)
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Construct the baseline S-Curve of the given network diagram belowB-2d 5
2
E-3d 5
1
A-5d 4
3
D-6d 4
4
G-2d 3
6
C-4d 5
5
F-3d 4
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Construct a Gantt Chart showing all of the activities start and finish.
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Plot the Baseline S-Curve
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Prior to project commencement, a schedule is prepared outlining the proposed allocation of resources and the timing of tasks necessary to complete the project within a set time frame and budget. This schedule is referred to as the Baseline Schedule. From this schedule, a Baseline S-curve is generated. This S-curve reflects the planned progress of the project. If the project requirements change prior to commencement (e.g. change of scope, delayed start), the Baseline Schedule may require revision to reflect the changed requirements.
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Following project commencement, modification of the Baseline Schedule is usually required. Changes are continually made to the Production Schedule (which is originally the same as the Baseline Schedule). The production schedule reflects the actual progress of the project to date, and any revisions made to tasks yet to commence or not yet completed. From this schedule, a Target S-curve may be generated. This S-curve reflects the ideal progress of the project if all tasks are completed as currently scheduled. In an ideal world, the Target S-curve will meet the Baseline S-curve at the end of the project (On Time, On Budget) or finish below and to the left of the Baseline S-curve (Early, Under Budget). In reality, it is not uncommon for the Target S-curve to finish above and to the right of the Baseline S-curve (Late, Over Budget).
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The production schedule is updated on a regular basis throughout the duration of the project. These updates include the revision of percentage complete for each task to date. Using this information, an Actual S-curve may be generated. This S-curve reflects the actual progress of the project to date, and may be compared with the Baseline and Target S-curves to determine how the project is progressing. During the project, the Actual S-curve will terminate at the Cut Off Date. This is the date the Production Schedule was last updated. At the completion of the project, the Actual S-curve will meet the Target S-curve.
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Construct the baseline, target, and actual S-Curve of the diagram and data below. Also, determine the growth, slippage, and progress of the Project.1 Task 1 3 Task 2 3 2 Task 3 3 3
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Activity A B C
Duration
Baseline Men-Hours
Baseline Men-Hours Per day
Task/Day A B
First Day
Second Day
Third Day
Fourth Day
Fifth Day
CTotal per day Year-to-Date Total
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Project schedule
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Activity 1 2 3
Duration
% complete
Men-Hours
Baseline Men-Hours Per day
100 50 25
24 36 36
Task/Day 1 2
First Day
Second Day
Third Day
Fourth Day
Fifth Day
Sixth Day
3Total per day Year-to-Date Total
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Task name Task 1 Task 2 Task 3
Man hours 24 36 36
% complete 100 50 25
Status
Duration to date
Man hours to date
Task/Day1 2 3
First Day
Second Day
Third Day
Total per dayYear-to-Date TotalSunday, March 10, 2013
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Initial examination of the S-curves generated above reveal the following about the status of the project. 1. The project has grown in scope. (The Target S-curve finishes above the Baseline S-curve) 2. The project has slipped. (The Target S-curve finishes to the right of the Baseline S-curve) 3. The project is behind schedule. (The Actual S-curve sits below the Target S-curve at the Cut Off Date)
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Operations keeps the lights on, strategy provides a light at the end of the tunnel, but project management is the train engine that moves the organization forward. Joy Gumz
For more information just go to the following links for the copy of the report and solution to worked problems
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Thank You for Listening!.
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