[CST-2] Business Studies

[Kevin Chan]

Hi,

Ok a systematic method:

Taking the diagram in 1998.8.5 as an example -

1.  Redraw all the boxes minus the durations and put in 4 empty boxes to
hold earliest start, earliest finish, latest start and latest finish.

2. Give a time to the start (Day 1 or something) and put it in the earliest
start of the first task.

3.  Add duration to earliest start to get earliest finish (obvious I know
but I am just being systematic =))

4. Use this earliest finish as the earliest start of the successor tasks.

5. Go through the whole diagram until you get to the end.  If a task has a
choice of earliest starts (i.e. it has more than one predeccessor and the
predeccessors have different earliest finish times) then take the latest
one.

6.  When you get to the end the earliest finish time of the last task is the
earliest finish time of the whole project.  Now work backwards from this
time to fill in the latest times in the obvious manner and that should do
it.

Critical Path = path on which all tasks have no slack (i.e. earliest start =
latest start and earliest finish = latest finish)

Hope that helps

Kev



----- Original Message -----
From: "Sapna Jethwa" <spj23@hermes.cam.ac.uk>
To: <cst-2@srcf.ucam.org>
Sent: Sunday, June 03, 2001 5:00 PM
Subject: [CST-2] Business Studies


>
> Hi
>
> Does anyone have or has anyone found a more systematic method of creating
> a PERT chart? I found one in a book, but the last few years of tripos
> questions seem to have different ideas about what a PERT chart is (i.e.
> some contain earliest/latest start/finish times and some simply have
> duration of events e.g. 1998-8-5 compared to lecture notes)
>
> Any comments?
>
> thanks again
> Sapna
>
>
>
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