Schedule Variance (SV)
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How to calculate and interpret SV as it is used in earned value analysis in project management. Download additional slides, videos, and resources at https://www.christiansonjs.com/ Signup for The Free-Range Technologist, a monthly newsletter filled with creative commons resources, useful apps, and lifehacks: https://mailchi.mp/f8f0219bc305/jscott
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Schedule Variance (SV)
- 2. Earned Value Analysis • Schedule Variance • SV = EV - PV • Negative is bad • Positive is good
- 3. Creating a Time-Phased BudgetTask Activity Budget (PV) Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Design prototype board $468 $78 $390 Order Sensors $156 $156 BreadBoard Sensors and connections $546 $234 $312 Outline programming requirements $390 $78 $312 Draft Preliminary Program $1,092 $78 $390 $390 $234 Load program and test $156 $156 Setup "Real" Twitter Account $39 $39 Develop Final Test Criteria $78 $78 Test $780 $78 $390 $312 Put into Case $39 $39 Complete Perm Install $156 $78 $78 Write up Details and Post $234 $234 Week Total $234 $1,326 $1,014 $702 $546 $312 Cumulative $234 $1,560 $2,574 $3,276 $3,822 $4,134 $0.00 $1,250.00 $2,500.00 $3,750.00 $5,000.00 Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Planned Value at this time in the project = $2574 Today
- 4. Actual Costs (AC) AC = $3,000
- 5. Percent of work complete 50% Earned Value Project Total PV = $4,134 EV= Total PV for Project or Activity X % Complete Today = End of Week Three
- 6. Percent of work complete 50% Earned Value EV= 4,134 X 50% = $2,067 Project Total PV = $4,134 Today = End of Week Three
- 7. $0.00 $1,250.00 $2,500.00 $3,750.00 $5,000.00 0 Week 1 Week 2 Week 3 PV AC EV
- 8. $0.00 $1,250.00 $2,500.00 $3,750.00 $5,000.00 0 Week 1 Week 2 Week 3 PV AC EV SV=EV-PV SV=$2,067-$2574 SV= -$507
- 9. Be Careful When Using Money to Measure Time
- 10. Percent of work complete 100% Earned Value EV= 4,134 X 100% = $4,134 Project Total PV = $4,134
- 11. $0.00 $1,250.00 $2,500.00 $3,750.00 $5,000.00 0 Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Week 7 PV AC EV SV= 0 PV = $2574 EV = $2574
- 12. Be Careful When Using Money to Measure Time
- 13. Indexes to Monitor Progress
Editor's Notes
- Earned value analysis has a long history, dating back to the 1930s, but it was not until the 1980s and 1990s that it became a common methodology in project management. EVA uses some basic information about our project to assess our current status and forecast future progress and final project costs and schedule. It is based on four main datapoints: the time-phased budget of our project, the current date, the percentage of work that is completed, and actual costs to complete that work. All this magic starts with our final project schedule and setting our project baseline.
- The time-phased baseline of the value of the work scheduled. An approved cost estimate of the resources scheduled in a time-phased cumulative baseline (BCWS—budgeted cost of the work scheduled).
- The actual cost of the work completed. The sum of the costs incurred in accomplishing work. (ACWP—actual cost of the work performed).
- And overall as a project we have 50% of the work complete:
- And overall as a project we have 50% of the work complete:
- The time-phased baseline of the value of the work scheduled. An approved cost estimate of the resources scheduled in a time-phased cumulative baseline (BCWS—budgeted cost of the work scheduled).
- The time-phased baseline of the value of the work scheduled. An approved cost estimate of the resources scheduled in a time-phased cumulative baseline (BCWS—budgeted cost of the work scheduled). We can now start our Earned Value Analysis, going beyond the basics of SV and CV.
- Using Money to Measure Time works fine while the activity or project is underway, but once the activity or project is completed, the SPI will be 1.00 regardless of how late the activity or project was delivered.
- And overall as a project we have 50% of the work complete:
- As you might be able to imagine, we can extrapolate from here. Where will we endup if things keep going the way they are, What will we need to do get thing back on track.
- Using Money to Measure Time works fine while the activity or project is underway, but once the activity or project is completed, the SPI will be 1.00 regardless of how late the activity or project was delivered.