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Lets say
task of putting
stealth paint on your time machine is most likely going to take three weeks. You must also then consider what is
longest it will take, and what is
shortest amount of time it will take to apply that paint. For example, five weeks and two weeks, respectively.
Here is
advantage of this method in EPM. You can manipulate your timelines effectively. If you feel that
original schedule is running a bit thin, and
overall project forecast was too optimistic, then you can give
pessimistic estimate a little more weight. For example, in this case, you can assign
timeline of six weeks to
paint job. Then, in
final PERT analysis, you will see
results skewed to a longer forecast.
Here is how an EPM can use
information from PERT analysis. As
project stakeholders are more edgy about technical tasks running over schedule (and rightly so), due to more chances of complications, a project overshooting its schedule due to a paint job will be a lot less painful to
stakeholders. This will allow you to give a lot less explanations, and use your time wisely to deliver
project on time. Of course, as a professional Project Manager, you know that if your project is really in trouble, do not use this technique to hide from reality.
Like I mentioned, you probably know CPM and PERT well. However, if you do not, I encourage you to seek it out and use it in your projects. There are many books and white papers written on it. If you are a traditional Project Manager, you can use these methods to tell you other important factors in your tasks as well. For example, if you notice
PERT estimates to be off by greater margins, then you must take a closer look at
task, as it is indicating greater risk, then a task that has a smaller spread.
Keep at a high level, and trust your team leads, by delegating
more specific analysis to them. And always remember, if you are an EPM, then use all this information to always keep
ultimate goal of
client, as your most fundamental requirement.

Shaun H. Ajani is the author of books "Extreme Project Management". He has been published in many national and international magazines. Shaun has worked with aviation, IT, retail, HR, finance, education, and training industries, in companies like Motorola, Dollar Stores, Nation Gifts, Code Factory, Washington Mutual, Boise Cascade, and Sears. Shaun Ajani consults as a Certified Project Manager in Chicago at Spherion.