Successfully reported this slideshow.
Upcoming SlideShare
×

# Bottom-up time estimations techiques

828 views

Published on

An overview of bottom-up time estimations techniques 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

Published in: Engineering
• Full Name
Comment goes here.

Are you sure you want to Yes No
• Get the best essay, research papers or dissertations. from ⇒ www.HelpWriting.net ⇐ A team of professional authors with huge experience will give u a result that will overcome your expectations.

Are you sure you want to  Yes  No

Are you sure you want to  Yes  No

Are you sure you want to  Yes  No

Are you sure you want to  Yes  No
• Be the first to like this

### Bottom-up time estimations techiques

1. 1. Bottom-Up (Micro) • Single-Point Estimation • Three-Point Estimates • Multiple Estimators • Delphi Technique
2. 2. 1. Have people familiar with the tasks make the estimate. 2. Use several people to make estimates. 3. Base estimates on normal conditions, efﬁcient methods, and a normal level of resources. 4. Use consistent time units in estimating task times. 5. Treat each task as independent, don’t aggregate. 6. Don’t make allowances for contingencies. 7. Adding a risk assessment helps avoid surprises to stakeholders. Estimating Guidelines for Times,   Costs, and Resources
3. 3. Single Point Estimation 30 Days to Complete How long will Task A take to complete? Bottom-up (Micro)
4. 4. Three-Point Estimates How long will Task A take to complete? Optimistic (a) 20 days Most Likely (m) 30 days Pessimistic (b) 58 days
5. 5. Three-Point Estimates Optimistic (a) 20 days Most Likely (m) 30 days Pessimistic (b) 58 days How long will Task A take to complete? 20 Days + 30 Days + 58 Days 3 Estimates = 36 days Triangular Distribution or simple average
6. 6. Activity Time Calculations weighted average activity time =Te
7. 7. Activity Time Calculations Te a + 4m + b 6 =
8. 8. Three-Point Estimates How long will Task A take to complete? te 20+ 4*30 + 58 6 = Optimistic (a) 20 days Most Likely (m) 30 days Pessimistic (b) 58 days
9. 9. Three-Point Estimates How long will Task A take to complete? te = 33.00 days Optimistic (a) 20 days Most Likely (m) 30 days Pessimistic (b) 58 days
10. 10. Beta Distribution Optimistic (a) LikelinessorProbability—> Most Likely (m) Pessimistic (b) te
11. 11. Beta Distribution Optimistic (a) LikelinessorProbability—> Most Likely (m) Pessimistic (b) 33.00 days
12. 12. Three-Point Estimates Estimated Project Duration: 243 days Probably that project will be done in 250 days: 74% PERT Analysis
13. 13. Multiple Estimators Bottom Up Estimating Estimator 1 Estimator 2 Estimator 33 20 Days 30 Days 50 Days Bottom-up (Micro)
14. 14. Multiple Estimators Bottom Up Estimating Estimator 1 Estimator 2 Estimator 33 20 Days 30 Days 50 Days Bottom-up (Micro)
15. 15. Multiple Estimators Bottom Up Estimating 20 Days Estimator 1 Estimator 2 Estimator 33 20 Days + 30 Days + 50 Days 3 Estimators = 33.3 Days Bottom-up (Micro) 30 Days 50 Days
16. 16. Delphi Technique
17. 17. Multiple Estimators Estimator 1 Estimator 2 Estimator 3 30 days 3 Bottom-up (Micro)
18. 18. Bottom-Up (Micro) • Single-Point Estimation • Three-Point Estimates • Multiple Estimators • Delphi Technique