Planner answers
Straight answers for planners
Short, practical answers to the questions planners and claims consultants search for every day: Primavera P6, delay analysis, EOT claims and FIDIC. Each links to a free tool that does the job.
How do I fix out-of-sequence activities in Primavera P6?An activity is out of sequence when it has progress but its predecessor has not finished (FS) or started (SS). Fix the logic to match what really happ…Read the answer →Retained logic or progress override in P6: which should I use?Use retained logic for contract programmes. It keeps the remaining work of an out-of-sequence activity behind its unfinished predecessors, so the fore…Read the answer →What causes negative float in a P6 programme?Negative float appears only when a date the logic cannot meet is imposed: a finish-on-or-before or mandatory constraint, or the project's Must Finish …Read the answer →How can I reduce the size of a P6 XER file?Most of a large XER is global data the schedule does not use: the OBS table, unused activity codes, resources, calendars and user fields. Removing the…Read the answer →What is a half-step (bifurcated) windows analysis?A half-step splits each window into two moves: first the previous update is re-scheduled with only the new progress, then the revised logic and durati…Read the answer →What is a fragnet in a Time Impact Analysis?A fragnet (fragmentary network) is a small set of activities and links that represents a delay event - for example late drawings followed by redesign.…Read the answer →What is concurrent delay in construction?Concurrent delay is when an employer delay and a contractor delay both affect the critical path at the same time. Under the SCL Delay and Disruption P…Read the answer →How do you calculate prolongation costs: Hudson, Emden or Eichleay?Site overheads are priced from records per day of delay. Head-office overheads are usually estimated with a formula: Hudson uses the tendered overhead…Read the answer →What are the FIDIC claim notice periods?FIDIC 1999 Clause 20.1 and FIDIC 2017 Sub-Clause 20.2.1 require a Notice of Claim within 28 days of becoming aware of the event. The fully detailed cl…Read the answer →What are the DCMA 14-point schedule check thresholds?Missing logic ≤ 5%, leads 0, lags ≤ 5%, finish-to-start links ≥ 90%, hard constraints ≤ 5%, high float (>44 days) ≤ 5%, negative float 0, high duratio…Read the answer →What are BEI and CPLI in schedule analysis?BEI (Baseline Execution Index) is the number of activities completed divided by the number that should have been completed by now; below 0.95 means th…Read the answer →How do you prepare a recovery programme?Start from the latest update, find the activities that drive the finish, then shorten them where crews really can (more crews, a second shift) and ove…Read the answer →