[Year 12 IT Apps] information needed for gantt charts

[Allan Barnes]

I would agree with your definition of lead time.

 

Slack time - in my opinion - is the 'delay' in a task on a non-critical path
where the start of a task can be delayed without lengthening the overall
time taken for the project. For example, if the critical path takes 10 days,
and there are two tasks on the non-critical path that each take 2 days each,
then the slack time for task 2 could be up to 6 days - task 2 can be delayed
by 6 days and still finish in the 10 days taken for the critical path, as
long as there is no delay on task 1.

 

 

 

 

Kind regards

 

Allan Barnes, CEO

Australian Institute of Education and Training

P.O. Box 171

Brunswick West 3055

Ph: (03) 9387 2051

FAX: (03) 9387 3470

Mobile: 0409 428 221

From: itapps-bounces at edulists.com.au [mailto:itapps-bounces at edulists.com.au]
On Behalf Of PARAGREEN, Chris
Sent: Thursday, 5 March 2009 12:37 PM
To: Year 12 IT Applications Teachers' Mailing List
Subject: RE: [Year 12 IT Apps] information needed for gantt charts

 

My first post as a newbie IT teacher!

 

"Just" a question about some of the definitions for Gantt charts..

According to Potts (p30), lead time is, ". time leading up to or before a
task." It further explains the concept, but essentially this is it.

My understanding is that lead time is the time available to begin a
dependant task before its predecessor is finished.

For example, you can't set up a computer until the box has arrived, but you
can prepare the room in advance.

 

Similarly, Potts states that slack time and lag time are the same thing,
whereas I think they are not.

Slack is the available time to allow for delays, but lag is the time between
when a task finishes and when it's dependant task can begin.

For example, if pouring concrete, the actually pouring task might have
finished, but you have to wait for the concrete to cure (the lag time)
before you can paint it.

 

Are my definitions too precise for what we need to teach, am I wrong, or am
I missing something?

 

Regards,

 

 

Chris Paragreen

IT, Mathematics and Japanese Teacher and Timetabler

Kew High School

1393 Burke Road

Kew East VIC 3102

phone +613 9859 8652 fax +613 9819 7880

 <mailto:chris.paragreen at kew.vic.edu.au> chris.paragreen at kew.vic.edu.au

2008 International Year of Languages 

Languages Still Matter! 

 

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