Jaa

ReliabilityQuality of Data

  • Artikkeli

In the past few weeks I have seen a ton of questions floating around about users of project management systems wanting to see reporting showing resource capacity vs. demand. Now you might be saying “But Brian, that is pretty common. Doesn’t EVERYONE want this kind of data from their PM system?” to which I would reply “Certainly, but these requests were different in that they all wanted to see it for time periods going out as far as 2 years into the future.” My question is what is someone going to do with a comparison between demand (scheduled work) and availability that far into the future? The instant answer I always get is that they want to see how the current load of projects scheduled is placing demand on their resources and that is a good answer. But in my opinion most organizations are just not good enough at scheduling and estimating and forecasting to make schedule data that far into the future of a quality that would support any real decision making around demand\capacity problems. Schedules are hard enough to get accurate for the next 2 months let alone the next 2 years.

There are industries or environments\situations where the type of projects being done are easy to estimate because they have a high similarity with projects that have already been done but for the most part capacity\demand data derived from project schedules should be looked at as ‘fuzzy’ if the time period of the data is farther out than a few months and even fuzzier if it is more than a year out.

There are decisions that can be made based on this data but they should be made with the knowledge that those numbers could swing wildly in some cases depending on changes to the project as it moves forward. The adage that some data is better than no data holds true for the most part but ‘some data’ that is highly suspect but still used in the decision making process as if it was certain is worse than no data.

When you are looking at data that depends on the quality of your schedule estimates and project WBS you need to think about that quality when you make decisions based on that data. Where are those estimates coming from? Are they top-down estimates (like many that are that far out into the future) or are they bottoms-up estimates coming from the resources that will do the work (hard to do when the tasks in question are months or even over a year in the future?

Comments

  • Anonymous
    January 01, 2003
    Im confused a bit. Your statement about top down being about portfolio level and your statement about bottoms up being hard to justify seem to be in conflict. If top-down is about portfolio level allocations and priorities and bottoms-up estimates are hard to justify based on level of effort then where are projets getting their estimates and status information? I also dont think that my post is emphesizes the need for both (though I do think that both should be in place in a good system). I think it emphesizes the need to be careful when looking at ANY data (bottom up or top down) that is far into the future.

  • Anonymous
    October 10, 2008
    This empahsizes the need for systems to be able to incorporate both bottom-up and top down resource planning and tracking. Top-down is more about portfolio level resource allocations, priorities, and organization capacity than it is about managing individual projects. To me, if you have a very heterogenous workforce and a limited need to track detailed human resource monetary costs on individual projects, the amount of effort required to capture bottom up resource data (planned or actual) is hard to justify.

  • Anonymous
    October 20, 2008
    Brian, I think the thing that people really want is a seamless way of forecasting demand and availability. Surely, your precise needs three years out are going to be fuzzy, so people estimate them in some sort of spreadsheet and build their long term plans on those estimates. Perhaps they even work on a recruitment and training plan to get those resources in place. Then as they get closer they want to look at things a bit more closely and finally get to individual assignments. Right now Project and Project Server and Portfolio Server only do this in a very awkward way. Working with FTE's (full-time equivalents) isn't supported in the data analysis views and there is no easy way to do things like resource constraint analysis. Doing this while still displaying a confidence interval would be a great help. I expect that would take a bit of training to achieve though. Many are used to taking the one number that excel gives or the project finish date that project gives as "the answer" when in reality, it is just one of many possible answers. Until people understand that, there is little point in spending much time generating the models in the first place.