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Can assign same resource to different activities/projects at same time in p6 v8.2 ???

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G Abbasi
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Hello Every One,

Can we assign same resource (e.g  electircal technician) to differenct projects or withins same project at same time in primavera p6 r8.2.

I am trying to manage my department resources on multiple projects, one resource not to assign multiple acitivities at same time acitivities.

Please help

Thanks 

Replies

Rafael Davila
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Joined: 1 Mar 2004
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Over allocations makes the schedule unfeasible, if you leave over allocated resources you have not completed making your schedule 100% feasible. If you do this you might end up solving over allocations late in a far from efficient manner.

Would be like planning and submitting only next month activities on a 25 months schedule without considering what are the future implications, the full sequence of activities and resource usage shall be considered, that is not planning but improvisation at its worst. 

If your planning software resource leveling capabilities are poor you will have to make it up manually until the plan is feasible.

Among the many weakness of poor scheduling engines is that they cannot model variations in your resource usage. Say you have an activity that with most efficient crew composition requires 10 masons but for next 6 weeks only 9 will be available.  With the optimal composition of 10 masons it will take 10 days to do the task but with 9 it will take 12 days. Even for a rookie PM it would be a no brainer, better to start ASAP using 9 masons and finish within 12 days rather than wait 6 weeks to start your task + 10 days to finish your task.

Suppose the 10th mason is on vacation for 5 days a week from now, again it might be dumb to delay or interrupt the activity.

At times increase/decrease in crew production rate is linearly related to resource quantity while at other times it is not linear, both scenarios are common. If your software provides good resource planning tools it shall use the computer power to solve these scenarios at a single click of the mouse otherwise you will have no option than to use manual methods on every schedule run. 

Learn to use the resource leveling functionality of your software, no matter how poor it is. Learn how to avoid not only over allocations but also unnecessary idle resources. Just imagine in the previous example the 9 available masons being idle for six weeks waiting for the 10nth. Yes some [most] software are so dumb, you must know the limits of you software, especially if so dumb. Dumb models will usually end up in dumb schedules. 

Raymund de Laza
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You need to set the Limits of your Resources in the Resource Control Pane. I guess you are using P6.

Please note that you can not avoid over allocation, but you will be notified of over allocation when previewing in the Resource Profile.

Rafael Davila
User offline. Last seen 34 min 34 sec ago. Offline
Joined: 1 Mar 2004
Posts: 4780

Before resource leveling all software might over allocate resources, in order to prevent over allocations you shall execute the resource leveling run.

Let say you have two activities not linked to each other that can happen at the same time. If you assign the same resource to both activities at full workload and there is only one unit available if you make a schedule run without resource leveling the activities can be scheduled to happen at the same time even when the re are not enough resources. If you run the resource leveling then one of the two activities will be delayed as to eliminate the resource availability conflict making it feasible under the resource limitations. 

Good luck.

G Abbasi
User offline. Last seen 5 years 51 weeks ago. Offline
Joined: 26 Sep 2013
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Thanks for your response,

Exactly i wanted to know that how to prevent to reduce the overlocated the resource in multiple activities. 

In MS Project it, if any resource assign to two different activities in between the duration of time, it indicates resource overlocated mentioned in figure. But in P6 i didn't found like this.

Can any one know about this to how to do this in P6.

 

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sapmple.jpg

Albert Balogo
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You can apply a single resource name in any activity but you shoud have enough quantity on your resouce dectionary, it is to avoid overallocations.

Rafael Davila
User offline. Last seen 34 min 34 sec ago. Offline
Joined: 1 Mar 2004
Posts: 4780

Full assignment will prevent a resource being shared among several activities occurring at the same time, this is the most basic and common resource assignment. You shall be able to assign the same resource to different activities in parallel occurring at the same time within same or different projects if using partial assignments. 

In the following figure it was assumed there is only one crane available and the crane could handle 10 lifts per hour or 80 lifts per 8 hour day, Activity 1 requires 60 lifts per day or 75% of the crane capacity, Activity 2 requires 20 lifts per day or 25% of crane capacity while Activity 3 requires 80 lifts per day or 100% crane capacity. For the duration of the activities a total of 800 lifts would be performed.

 photo 9-26-201310-33-57AM_zps491ca070.jpg

Just imagine modeling each lift with an activity per lift, 80 lifts per day for 10 days, a whooping 800 activities.

But you somehow must consider the lift capacity of your crane, assigning the crane to a hammock activity will not result in correct resource leveling as it will allow for all activities to occur at the same time. What if a hundred activities in parallel all requiring the crane? I have seen at PP many schedulers suggesting the hammock approach when it can yield to abominably erroneous schedules. 

Beware some software cannot handle this issue correctly even if they provide for some partial workload modeling. 

How P6 does it I do not know as I do not use it.

Partial assignments occur every day, not necessarily in all activities but in a substantial number. It is not limited to equipment resources but also to labor resources and whole crews. 

Ruel Catapang
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You can assign same resources to different projects as long as your resources are under global. Meaning to say, your resources are classified as enterprise data.