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One tip I cannot stress enough: be liberal in your entry fields; do not over-validate. I have been to many sites which kick up errors if:
* You do not enter a Mr/Mrs/Miss. This is archaic and no-one's business.
* You do not pick a state or province from a valid list. Not everyone lives in North America.
* You do not enter a postal code / zip. Ditto to above. For example, in Ireland there are no postal codes!
Rule: Collect the minimum amount of information you need for the task in hand. You can get the rest later if you need it.
Rule: Don't put up extra barriers in front of people who want to use your site.
Rule: Validate information on the back-end. Do not expect javascript to do it for you as this does not help in the case of site attacks (eg: entering URLs with query strings directly).
I am sure there's more but that's off the top of my head.
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"out of environment space"
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