That's what I addressed. You have to define what a complete set of data is and keep track of it on the server. Then, by looking at the blanks left in that set of data, you send the user to the pages he needs to fill out. Finally, you have accumulated what appears to be a complete set of data; then and only then do you actually commit any changes to the actual database.
It really is quite simple - sort of a reduced model/view/controller design.
Makeshifts last the longest.
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