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Making an activity happen lonesome (no other activity should occur during this activity)

7 replies [Last post]
SAAJAN PATEL
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Joined: 6 Aug 2019
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Hello,

 

I am new to Planning Planet and usually i have a couple of people I consult to when it comes to P6 questions but they have never dealth with this issue before and if they have, they have done it in a manipulative way. 

 

So here is the issue, i have an activity which is for Spray Foam Insulation. My specification specifically states i cannot have another activity happen at this time or 24 hours after this activity. Thus i make this activity 2 days long, one for the actual spray foam insulation and one for the 24 hour waiting period. I have the proper predecessors and successors but i have other activities that are happening at the same time. I do not want to tie these as predecessors to the Spray Foam Insulation because the sequence will not make sense, the client (Army Corp) will not approve of that type of sequence, and in the long run i would rather have an accurate schedule to begin with. How can i make this activity (whether it is some sort of setting or such) happen where no other activity can happen. Only other way around i see this is if i make it a 5 or 7 day activity allowing me wiggle room for this activity to happen. Please let me know your thoughts.

 

P6 i am using:

Primavera P6 Professional 18
Release: 18.8.0
Platform: x64
 

Thank you, I appreciate there being a Forum for P6 users.

Replies

Rafael Davila
User offline. Last seen 2 hours 20 min ago. Offline
Joined: 1 Mar 2004
Posts: 4779

Please be reminded lonesome activities will not move if you have fixed it to happen only within a fixed window of time.

In order to figure it out if it moves, upon every update you must release the exception to see if/where it moves and if it moves then decide how to fix it again.  Similar to manual resource leveling where you must release resource logic or “soft links” upon every update.

With the use of a resource leveling functionality within your software you can create a schedule model that will meet the lonesome activity requirements no matter if they move. 

I cannot see a justification to use manual methods when the software can automatically implement the lonesome activity requirements. 

In some cases you might have lonesome activities requirement specific to hundreds of individual project areas.  To manual level such schedule is not a good idea when a similar resource leveling approach can do it so easily at a single click of the mouse.

Multiple-Lonesome-Areas

Kannan CP
User offline. Last seen 2 days 23 hours ago. Offline
Joined: 12 Jun 2008
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Hi Sajaan,

In my understanding it is not a mandatory relationship, but depends on the site situation at the time of spray foam insulation at site.

May be the parallel activities planned at the time of spary foam works finished earlier, or not yet started, or ongoing as planned. 

When you make the schedule, create a calendar/s suiting to the situation, assuming that no other activities will happen along with spray foam works. you cannot predict the future as it is not a hard logic, rather than creating a realistic schedule as per the best information currently available.

closely monitor the production, and if it is not going to happen as planned, then revise the schedule-again the same exercise as above.

Kannan

Zoltan Palffy
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Raf thats true but at some point in time you have to PLAN it to happen there. If it moves then you re-plan your window

Rafael Davila
User offline. Last seen 2 hours 20 min ago. Offline
Joined: 1 Mar 2004
Posts: 4779

Fixing exception time will not make it if Spray Foam Insulation activity is delayed beyond exception window, if Spray foam activity could start earlier than original plan as the schedule moves on then it will be scheduled late.  

The main reason we use CPM software is because we need dynamic models, otherwise we would be drawing our schedules using paint software. 

Zoltan Palffy
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what you can do is to block out the day after the Spray Foam in your calendar and make it an exception and nothing can happen on that day. You can even define the TIIME in hours to be blocked out.

also you can add another calendar and only assign that 2 day activity to that calendar it will be the same as the other calendar but will NOT block out the 2 day spraying time frame.

this way the only thing that can happen on that those 2 days is the spray foam and curing 

Rafael Davila
User offline. Last seen 2 hours 20 min ago. Offline
Joined: 1 Mar 2004
Posts: 4779

Consider using the resource leveling functionality within your software.

Create a special resource and make it available with such a high quantity it will not be overloaded if all except the lonesome activities happen at the same time.  Assign it to lonesome activities at maximum available quantity/effort and to each activity at minimum quantity/effort.  My software provide shortcuts that make it easy to assign a resource to multiple activities with ease, I expect your software provides similar functionality. 

Test your model by temporarily moving some activities using date constraints, resource leveling the schedule and verify if output is as expected, lonesome activities will not happen at the same time other activities do.

Click the following thumbnails for a larger view of a couple of images that should help.  The first image shows the unleveled schedule and the second one shows the leveled schedule that meets the requirements for lonesome activities not to be scheduled at the same time with othe activities.

Lonesome-Activity-01    Lonesome-Activity-02

Sometimes resource leveling moves apart activities you need to be contiguous if this happens with the two lonesome activities you might just keep them as if a single activity, a trade-off between some granularity and the need to keep them together. For this purpose sometimes I make use of ALAP constraint on first lonesome activity, you might try it but I understand in P6 such option is ignored when resource leveling.

https://tensix.com/2015/12/primavera-p6-and-the-as-late-as-possible-alap-constraint/

Good Luck,

Rafael

SAAJAN PATEL
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Joined: 6 Aug 2019
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Accidently created multiple post of the same content, can an admit delete all the extra posts?