[Year 12 IT Apps] RE: itapps Digest, Vol 49, Issue 19

Thu Mar 5 14:14:58 EST 2009

Hello Everyone

I have only 4 students in my IT Apps class and need to partner up with another school for moderation. If there is anyone in the general direction/area of Deer Park that would be happy to partner up could you please email me.

Thanks

Sandra Mobbs
St Joseph's College Melbourne
smobbs at sjcmelb.catholic.edu.au

________________________________

From: itapps-bounces at edulists.com.au on behalf of itapps-request at edulists.com.au
Sent: Thu 5/03/2009 1:37 PM
To: itapps at edulists.com.au
Subject: itapps Digest, Vol 49, Issue 19

Send itapps mailing list submissions to
        itapps at edulists.com.au

To subscribe or unsubscribe via the World Wide Web, visit
        http://www.edulists.com.au/mailman/listinfo/itapps
or, via email, send a message with subject or body 'help' to
        itapps-request at edulists.com.au

You can reach the person managing the list at
        itapps-owner at edulists.com.au

When replying, please edit your Subject line so it is more specific
than "Re: Contents of itapps digest..."

Today's Topics:

   1. RE: information needed for gantt charts (PARAGREEN,  Chris)
   2. Re: information needed for gantt charts (Mark Kelly)
   3. RE: information needed for gantt charts (Allan Barnes)

----------------------------------------------------------------------

Message: 1
Date: Thu, 5 Mar 2009 12:36:55 +1100
From: "PARAGREEN,  Chris" <Chris.PARAGREEN at kew.vic.edu.au>
Subject: RE: [Year 12 IT Apps] information needed for gantt charts
To: "Year 12 IT Applications Teachers' Mailing List"
        <itapps at edulists.com.au>
Message-ID:
        <A3D8B10E8C0C6E48B45AB6DECF4357E4039C7700D3 at QEXCH.kew.vic.edu.au>
Content-Type: text/plain; charset="us-ascii"

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!

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.edulists.com.au/pipermail/itapps/attachments/20090305/ecf6a0d4/attachment-0001.html

------------------------------

Message: 2
Date: Thu, 05 Mar 2009 13:26:34 +1100
From: Mark Kelly <kel at mckinnonsc.vic.edu.au>
Subject: Re: [Year 12 IT Apps] information needed for gantt charts
To: "Year 12 IT Applications Teachers' Mailing List"
        <itapps at edulists.com.au>
Message-ID: <49AF385A.7050404 at mckinnonsc.vic.edu.au>
Content-Type: text/plain; charset=windows-1252; format=flowed

PARAGREEN, Chris wrote:
> My first post as a newbie IT teacher!

Welcome!

> "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.

Yes, that's how I understand it too.  While, strictly speaking, a
dependent task cannot begin until its predecessor ends, in the real
world it's sometimes possible to start a little early.

> 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.

Yes.  Slack is the time difference between two concurrent tasks of
unequal duration.

> 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.

That's how I understand it too.  Slack is not lag.
>
> Are my definitions too precise for what we need to teach, am I wrong, or
> am I missing something?

Nope.  We agree.  It's worth mentioning it to the kids, but don't bust a
gasket over it.  The exam has never assessed lag or lead time before,
The most complex it got has been having a dummy task once (which, by the
way, it got wrong!)

Cheers!
Mark

>
> 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! *
>

--
Mark Kelly
Manager - Information Systems
McKinnon Secondary College
McKinnon Rd McKinnon 3204, Victoria, Australia
Direct line / Voicemail: 8520 9085
School Phone +613 8520 9000
School Fax +613 9578 9253
kel at mckinnonsc.vic.edu.au

Webmaster - http://www.mckinnonsc.vic.edu.au <http://www.mckinnonsc.vic.edu.au/> 
IT Lecture notes: http://vceit.com <http://vceit.com/> 
Moderator: IT Applications Mailing List

RealMenDon'tNeedSpacebars.

------------------------------

Message: 3
Date: Thu, 5 Mar 2009 13:37:17 +1100
From: "Allan Barnes" <abarnes at aiet.com.au>
Subject: RE: [Year 12 IT Apps] information needed for gantt charts
To: "'Year 12 IT Applications Teachers' Mailing List'"
        <itapps at edulists.com.au>
Message-ID: <002401c99d3b$4d5e5970$e81b0c50$@com.au>
Content-Type: text/plain; charset="us-ascii"

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!

_______________________________________________
http://www.edulists.com.au <http://www.edulists.com.au/>   <http://www.edulists.com.au <http://www.edulists.com.au/> > - FAQ, resources,
subscribe, unsubscribe
IT Applications Mailing List kindly supported by
http://www.vcaa.vic.edu.au/vce/studies/infotech/infotechindex.html
<http://www.vcaa.vic.edu.au/vce/studies/infotech/itapplications3-4.html%20>
- Victorian Curriculum and Assessment Authority and
http://www.vitta.org.au <http://www.vitta.org.au/>   <http://www.vitta.org.au <http://www.vitta.org.au/> > - VITTA Victorian
Information Technology Teachers Association Inc

--
This message has been scanned for viruses and
dangerous content by  <http://www.mailscanner.info/> MailScanner, and is
believed to be clean.

  _____ 

Message protected by MailGuard: e-mail anti-virus, anti-spam and content
filtering.
http://www.mailguard.com.au/mg

Report
<https://login.mailguard.com.au/report/1wZqgKZrOL/6vk2c1esOgh4G5c0ca4lXw/0.0
02>  this message as spam 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.edulists.com.au/pipermail/itapps/attachments/20090305/11c51931/attachment.html

------------------------------

_______________________________________________
itapps mailing list
itapps at edulists.com.au
http://www.edulists.com.au/mailman/listinfo/itapps

End of itapps Digest, Vol 49, Issue 19
**************************************

-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/ms-tnef
Size: 13672 bytes
Desc: not available
Url : http://www.edulists.com.au/pipermail/itapps/attachments/20090305/c82d0044/attachment-0001.bin