ESTIMATE ACTIVITY DURATIONS IS THE PROCESS OF ESTIMATING THE NUMBER OF WORK PERIODS NEEDED TO COMPLETE INDIVIDUAL
ACTIVITIES WITH ESTIMATED RESOURCES
ROLE OF THE PROJECT MANAGER IN ESTIMATING IS TO:
1. PROVIDE THE TEAM WITH ENOUGH
INFORMATION TO PROPERLY ESTIMATE
EACH ACTIVITY
2. LET THOSE DOING THE ESTIMATING KNOW HOW
REFINED THEIR ESTIMATES MUST BE
3. COMPLETE A
SANITY CHECK OF
THE ESTIMATES
4. PREVENT PADDING.PADDING IS EXTRA
TIME OR COST ADDED TO AN ESTIMATE
BECAUSE THE ESTIMATOR DOES NOT
HAVE ENOUGH INFORMATION
5. FORMULATE A RESERVE
6. MAKE ASSURE ASSUMPTIONS MADE
DURING ETIMATING ARE RECORDED FOR
LATER REVIEW
1. SHEDULE MANAGEMENT PLAN
2. ACTIVITY LIST
3. ACTIVITY ATRIBUTESS
4.ACTIVITY RESOURCES REQUIREMENTS
5. RESOURCES CALENDARS
6. PROJECT SCOPE STAMENTS
7. RISK REGISTER
8.RESOURCES BREAKDOWN
9. ENTERRPRISE ENVIRONMENTAL FACTORS
10. ORGANIZATIONAL PROCESS ASSETS
1. EXPERT JUDGMENTS. GUIDED BY HISTORICAL
INFORMATION FROM SIMILAR PROJECTS
2. ANALOGOUS ESTIMATING. TO ESTIMATE COST OF AN ACTIVITY OF A PROJECT OF
HISTORICAL DATA. USED WHEN THERE IS LIMITED INFORMATION. GENERALLY NOT AS
ACCURATE AS OTHER ESTIMATING TECHIQUES
4. THREE POINT ESTIMATING. TRIANGULAR
DISTRIBUTION AVERAGE (P+O+M)/3
P=PESSIMISTIC, O=OPTIMISTIC,M=MAS
PROBABLE. TRIANGULAR DISTRIBUTION BETA
(P+4M+O)/6 BETA ACTIVITY STANDARD DEVIATION =P-O/6
3.PARAMETRIC ESTIMATING. HISTORICAL RECORDS FROM
PREVIOUS PROJECTS. USES AN STATISTICAL RELATIONSHIP
BETWEEN HISTORICAL DATA AND OTHER VARIABLES
5. GROUP DECISION-MAKING TECNIQUES. USES
BRAINSTORMING, AND DELPHI.
6. RESERVE ANALYSIS . TIMES RESERVES IN THE
GLOBAL SCHEDULE F THE PROJECT.