One control that is applicable for almost any system is "enter data close to the originating source". A customer entering a purchase into an online sales system (such as at Amazon.com) is an excellent example of this control.

Describe the details of why a process with this control would produce fewer errors than a process where the sales clerk manually writes down the customer's order. Be sure to address the concepts of input validity, input completeness, and input accuracy in your answer. Hint: Think about who is the originating source in this example. What potential issues would you avoid by entering data close to this source in the overall process?