[Year 12 IT Apps] information needed for gantt charts

[PARAGREEN, Chris]

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
chris.paragreen at kew.vic.edu.au<mailto:chris.paragreen at kew.vic.edu.au>
2008 International Year of Languages
Languages Still Matter!

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