Quiz reporting is a key resource for me and I use quiz reports to monitor my students' progress through my courses. For automating the use of the data that comes through the quiz reports I need a unique identifier. As last names are not always unique, I use students' email addresses entered into the form that pops up at the start of each video with embedded quiz. Unfortunately I am finding that some students, usually the poor ones, sometimes supply email addresses with typos and misspellings. It would be helpful, in my view, to have the option to include a two email address fields that are required to match. Such data validation would help reduce such typos. Even when people copy and paste their email address into the second field it forces them to glance over it again to see if it is correct.