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Activity Padding

8 replies [Last post]
Rafael Davila
User offline. Last seen 5 days 7 hours ago. Offline
Joined: 1 Mar 2004
Posts: 5227

Paul it looks like you are still having anger problems.

AngerProblems photo AngerProblems_zpskah9m35n.jpg

Replies

Rafael Davila
User offline. Last seen 5 days 7 hours ago. Offline
Joined: 1 Mar 2004
Posts: 5227

It is wrong to manage a schedule under the assumption it will rain tomorrow and therefore there will be no scheduled work for tomorrow. 

  • To manage field schedule a 100% non padded schedule is necessary; this means no rain padding. 
  • To manage the contract a schedule that considers the rain allowance as well as, other contingencies, buffers and terminal float is necessary. 

Both shall be transparent, otherwise those in direct management of the means and methods will have no other option than to recur to a Ghost Schedule.

http://www.stevencevans.com/float/

http://www.fplotnick.com/constructioncpm/2016Presentations/MON37-PPR.pdf

abrugar jons
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Joined: 23 Jan 2017
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Hey Dr Paul.

A weather contingency is best placed on the callendar allocated to outdoor trades. Anticipated weather can then be substituted for real weather in the weekly update.

Simple realy.

Best regards

abrugar

Mike Testro
User offline. Last seen 1 day 18 hours ago. Offline
Joined: 14 Dec 2005
Posts: 4418

Hi Rafael

Most peopeprefer to do it properly.

Best regards

Mike Testro

Rafael Davila
User offline. Last seen 5 days 7 hours ago. Offline
Joined: 1 Mar 2004
Posts: 5227

Exactly, but still some people insist you manage with a plan that includes the assumption for some rain at specific dates or range of dates.   This is basic project risk management.

Mike Testro
User offline. Last seen 1 day 18 hours ago. Offline
Joined: 14 Dec 2005
Posts: 4418

Hi Rafael

You only stop work when the weather is bad - not when you have a wet day forecast on the programme.

Best regards

Mike Testro

Rafael Davila
User offline. Last seen 5 days 7 hours ago. Offline
Joined: 1 Mar 2004
Posts: 5227

I do not like strategies that promote lies and deception, schedules shall be transparent and not a bunch of lies.

Rafael Davila
User offline. Last seen 5 days 7 hours ago. Offline
Joined: 1 Mar 2004
Posts: 5227

Mike,

The calendar method shall be applied to determine extension of time but not for managing the schedule.  What if you plan for some rain and assume it will be tomorrow but it does not rains, the schedule will misled people into not working tomorrow.

Critical Chain promotes the use of separate activities as buffers to avoid padding, which is an improvement, but is flawed with regard to feeding buffers because as soon as the critical chain changes they might no longer be feeding into the critical chain and if not enough new feeding chains will happen.

https://wafimohtaseb.com/2012/05/27/project-scheduling-best-practices/

A better approach is favored by Spider Team, it does not depend on padding, it does not use activities to represent buffer, no special software is needed to apply the concept.

http://www.spiderproject.com/images/img/pdf/Success%20Driven%20Project%20Management%20Paper.pdf

Best Regards,

Rafael

Mike Testro
User offline. Last seen 1 day 18 hours ago. Offline
Joined: 14 Dec 2005
Posts: 4418

Hi Dr Paul.

A weather contingency is best placed on the callendar allocated to outdoor trades. Anticipated weather can then be substituted for real weather in the weekly update.

Simple realy.

Best regards

Mike testro