Larry,
I got the questions.
I don't have Concerto on my computer at the moment. I modeled it with
Sciforma PS8. I expected the project buffer penetration to go back to zero,
but it didn't. Very interesting.
Skip

_____

From: CriticalChain@yahoogroups.com [mailto:CriticalChain@yahoogroups.com]
On Behalf Of Lawrence
Sent: Tuesday, July 14, 2009 12:16 PM
To: CriticalChain@yahoogroups.com
Subject: [CriticalChain] Re: Buffer Penetration





Hi, Skip

Yes, you missed the two operational questions:

1. What is "the" project buffer penetration, to be used in deciding on
action?

2. What are the task buffer penetrations, to be used in task priority.

Regards,
Larry Leach

--- In CriticalChain@ <mailto:CriticalChain%40yahoogroups.com>
yahoogroups.com, "Skip" <skip@...> wrote:
>
> If the out-of-sequence task that was worked is on the critical chain and
> began with all its necessary inputs, then it has become part of the
critical
> chain that is complete. Therefore, 5 days of buffer has been recovered.
> There is nothing magical about the sequence of critical chain tasks unless
> there is a true dependency. If it is only a resource dependency, the order
> they are worked is not important.
>
> If the out-of-sequence task was not on the critical chain, then it only
> counts for its feeding chain. This would be where Earned Value says the
> project is more completed, but Critical Chain Project Management would
not.
>
> This seems straightforward. Did I miss something?
>
> Skip Reedy
>
> _____
>
> From: CriticalChain@ <mailto:CriticalChain%40yahoogroups.com>
yahoogroups.com [mailto:CriticalChain@
<mailto:CriticalChain%40yahoogroups.com> yahoogroups.com]
> On Behalf Of Crispin ("Kik") Piney
> Sent: Monday, July 13, 2009 11:29 PM
> To: CriticalChain@ <mailto:CriticalChain%40yahoogroups.com>
yahoogroups.com
> Subject: RE: [CriticalChain] Buffer Penetration
>
>
>
>
>
> Larry,
>
> I think this is a classic Earned Value discussion.
>
> Kik
>
> Crispin ("Kik") Piney, PgMP
>
> kik@PROject- <mailto:kik%40PROject-beneFITS.com> beneFITS.com
> +33 (0)680 11 57 77
>
>
> _____
>
> From: CriticalChain@ <mailto:CriticalChain%40yahoogroups.com>
> yahoogroups.com [mailto:CriticalChain@
> <mailto:CriticalChain%40yahoogroups.com> yahoogroups.com]
> On Behalf Of Lawrence
> Sent: 14 July 2009 00:20
> To: CriticalChain@ <mailto:CriticalChain%40yahoogroups.com>
yahoogroups.com
> Subject: [CriticalChain] Buffer Penetration
>
> Hi, All
>
> When you think about it simply, buffer penetration is a pretty simple
idea.
> For example, you can compare where a task is projectd to end, and subtract
> from that where it ended in the baseline plan, and you have the buffer
> penetration for that task. The largest buffer penetration in the project
is
> what you plot on the fever chart.
>
> Or maybe it isn't quite that simple?
>
> Consider, for example, doing tasks out of sequence. While that may seem
like
> it should not happen, as there was a reason to do them in a particlar
> sequence to start, suppose that sequence was simply to level the resource
> demand. Then, in execution, in order to recovery buffer, you assign a
> different resource, and do a downstream task early. Complete it! What is
the
> buffer penetration of the task that follows it?
>
> Let me make it more concrete. Consider a task on the critical chain, that
is
> now workinig, and is projected (with remaining duration) to finish 5 days
> later than it was scheduled in the baseline plan. The project buffer is 20
> days.
>
> As part of early buffer recovery, the next 5 day task in the chain has
> already been completed (out of sequence), by assigning another resource to
> it.
>
> In this case, what should be plotted on the fever chart? What should be
used
> as the priority (buffer impact) for the successor to the completed task
when
> comparing task prioirty for a given resource assigned to tasks on several
> projects?
>
> Regards,
> Larry Leach
>
> [Non-text portions of this message have been removed]
>
>
>
>
>
>
> [Non-text portions of this message have been removed]
>






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