20
Open Plan Download to 1 st Update
Open Plan
Download to 1st Update
Default password is PASSWORD
PDM Drafting Conventions
• Logic relationships between activities may be:– finish to start -- (Default)– start to start– finish to finish– start to finish– and variations of each
SS5
FS2
1000Activity #1 6 days
1005Activity #2 6 days
1010Activity #3 2 days
1015Activity #4 10 days
1020Activity #5 3 days
1025Activity #61 day
1030Activity # 7 4 days
1035Activity #8 4 days
1040Activity #9 5 days
1045Activity #10 6 days
FF2
SS0
Activity B
20
Activity A
15
FF 10
SS 5
PDM Drafting Conventions
• Lag Durations Between Activities• may delay the START or FINISH of the subsequent activity beyond
the START or FINISH of the specified preceding activity
Activity A- 10 days Activity B- 10 daysNo Activity - 10 days
Activity B
15
Activity A
20
FF 10
SS 5
Activity A- 20 days Lag - 10 days
Lag=5 Activity B- 15 days?
PDM Drafting Conventions
• Interpretation of Finish to Start relationship– what is meant by finish to start?– what is meant if Lag < 0 (negative Lag)?– what part of Activity A is not yet complete?– what part of Activity A is complete?
•SS+7 vs FS-3•what would be meant by FS-12?
Activity A 10 days
Activity B 15 days
PDM Drafting Conventions
• Interpretation of Start to Start relationship– what is meant by start to start?– start Activity B when Activity A is 50% complete
– which 50%? -- if the scope cannot be explained, the % is suspect
Activity A 10 days
Activity B 15 days
PDM Drafting Conventions
• Interpretation of Start to Start relationship– what is meant by start to start?– start Activity B when Activity A has 2 days Remaining Duration
– what scope during last two day? -- if unknown, lag duration is suspect
Activity A 10 days
Activity B 15 days
PDM Drafting Conventions
• Interpretation of Start to Start relationship– what is meant by start to start?– start Activity B when 3 days of Activity A’s OD has been performed
– this may be what we mean to say -- is it what we told the computer?
Activity A 10 days
Activity B 15 days
PDM Drafting Conventions
• Interpretation of Start to Start relationship– what is meant by start to start?– start Activity B when 3 days have passed since Activity A was started– or start Activity B when 3 days of Activity A have been performed
Activity A 10 days
Activity B 15 days
Activity A 10 days
Activity B 15 days
versus
3 days
3 days
PDM Drafting Conventions
• Interpretation of Start to Start relationship– what is meant if Lag > OD of Activity A?
Activity A 10 days
Activity B 15 days
Activity A 10 days
Activity B 15 days
versus
12 days
12 days?
Default password is PASSWORD
