Sharepoint 2007 - Creating a form to capture timesheets data, but need to track updates to previously submitted data

Question

Hi,
We are using a basic version of Sharepoint 2007 and do not have access to InfoPath. I have created a list to allow team members to submit their weekly time on specific activities.  How do I go about tracking any changes to previously submitted data?
For instance, a team member enters 5 hours for Activity 1 and submits on April 1.  on April 10 they realize they submitted too few hours and want to go in to edit the 5 hours to 12 hours.
From a reporting perspective we already pulled a report (export to excel) and have the 5 hours listed for April 1. If the user goes in to edit their time sheet from April 1, we don't want the data to just override the 5 hours, we want some sort of flag to
show the hours went from 5 to 12 hours.  How do we do this?
As a work around, I added a question at the beginning of the survey/list asking is this a new submission or an edit. I thought if they select edit and were taken to a screen that allowed them to select the date (April 1), the activity and the new hours that
I would have all of the previous data plus these 3 columns with the additional data: "Edit", "Activity 1", "12".  Instead the original data was over written and all I show are blanks for the previous questions and the edited
info ("Edit", "Activity 1", "12").
What suggestions do you have so that I can maintain the integrity of the original data and flag for my Project Manager which data needs to be changed in previous reports.
Thanks in advance!
AA

Answer 1

I think the best way to answer your question would be to create a simple form and try various submissions. Be aware that unless the e-mail system is controlled, e-mail submission is not recommended due to client configuration issues of e-mail. Your question sounds like online submission would already be something you are comfortable with. In that case you can submit form data in 3 different ways: HTML, FDF, or XML. It can also be submitted as a PDF by saving the form, but that does not sound like what you need and also gets into issues of whether folks are using Reader or Acrobat.
Also be careful (or try both) about using forms from within Acrobat and the forms created by the link in Acrobat to Designer. Once you go to Designer with the form you can not come back for editing in Acrobat. Normally you would create the basic form in a word processor or layout tool and then add the form fields in Acrobat (or Designer if that is preferred).
I will let others address the anonymous and yet confirmation check issue.