Smart Defaults instead of asking to do extra work.
conversion tip Using smart defaults or pre-filling form fields with educated guesses removes a number of work users have to do.
This is a common technique for helping users move through forms faster by being respectful of their limited time. One of the worst things from an experience and conversion standpoint is to ask people for data that they have already provided in the past, repeatedly over and over again. Try to display fields that are preloaded with values to be validated as opposed to asking for values to be retyped each time. The less work, the better.