Hi Edel,
It depends on how complex it is and the presentation
quality. You can use Insert=>Picture=>New Drawing,
which will bring up a MS Drawing Canvas in Word 2002 or
2003, or the MS Draw 98 add-in (if installed) in earlier
versions and create your diagram using the Autoshapes
from the Word drawing Toolbar.
For diagramming, MS Office Visio,
http://microsoft.com/office/visio
is the Office family app that is designed for that
type of task. There are also 3rd party apps such
as
http://smartdraw.com
========
Easiest way to create a flow diagram? >>
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I hope this helps you,
Bob Buckland ?

MS Office System Products MVP
*Courtesy is not expensive and can pay big dividends*
The Office 2003 System parts explained
http://microsoft.com/uk/office/preview/system.asp
MS on 'Why Office System 2003'
http://microsoft.com/mscorp/execmail/2003/10-13productivity.asp