Change management is an established discipline that helps organisation support all the changes a new system brings - not just installing new computers and software. There is the disruption to "business as usual" to be managed. Your processes will need updating, if not changing. And your people will need to get their heads around the new set up. There are lots of tools out there for change management but most are written for really large, commercial organisations. What do small charities need? We hope the following will be helpful. Just click on the link that best matches your situation.
(if the link isn't green the notes are not available yet - please be patient - they will all be there by the middle of May 2013. Contact usif you need them sooner)