Primavera is a wonderful tool but sometimes it’s calculations give weird results. For instance when filling in durations of an activity, you might’ve encountered a problem similar to the ones below:
- Your activity duration is showing as 5 days but it starts on the 1st and already ends the 4th
- Your units/time is showing 8h/d but Primavera is actually calculating with 12h/d
What is going on? Well it’s probably something to do with your hours per Time period settings.
Every planner regularly encounters negative total float in schedules where he didn’t expect it. This happens more often than one would like. And every time this is the start of a nerve-wracking search for the cause. In this post we list the most probable causes to give you guidance on where to start looking.
How can we get the most out of our EVM metrics? We’ve evaluated our current cost and schedule performance, and have seen how to forecast the Estimate At Completion (EAC). Now is the time to evaluate the realism of our project’s Budget At Completion (BAC). Following the current conditions, is the aimed for budget still sufficient?
One of the most powerful (and underutilized) measures EVM grants us is the To Complete Performance Index. This is the Cost Performance Index (CPI) at which you must execute the remainder of the work to deliver the project within a certain budget. The budget aimed for has sometimes become idealistic. Comparing the TCPI with the current CPI gives a good insight on whether the foreseen budget or the EAC remain realistic. The difference between the cumulative CPI and the TCPI value should trigger the re-evaluation of the Estimate At Completion.
As a follow-up to my last post about the difference between a time buffer and total float; here is a new post in the same series – seemingly easy concepts that seem to confuse many. This one might be an open door for financial or general management profiles, but it is not for most project controls engineers.
Calendars can have an impact on the total float activities, and thus on the critical path. This might seem somewhat confusing when first encountered, but once you understand how Primavera deals with this, it makes more sense.
An important consequence of this is the potential difference between the critical path and the longest path Primavera P6 can calculate. Standard settings in Primavera P6 will show all activities with zero total float as critical, but the longest path can consist out of activities with different amounts of total float. Find out how calendars are related to this and continue reading.