Checking Data

Trust is everything in this day and age. You have to trust a lot of people, from the guy who gives you directions to your local plumber. After all, you're not always the authority. However, when developing applications for the web, you must assume the role of authority. Otherwise, the user will assume the role, which is a big gamble: total data integrity, data corruption, or diversion of data -- if the user is the authority, you don't know what the results