The main purpose of system assurance is to deliver a quality product. Conformance to requirements increases the organization’s confidence in the system.

An e-commerce system deals with three parties: the bank, the transaction clearinghouse, and the customer. The interdependency of these three parties makes the process of buying and selling over the Internet more critical than in real life. If the faith of any of these parties dwindles in the e-commerce site, the entrepreneurs can lose a lot of money, as well as their reputation.

For example, in the case of a faulty e-commerce system, the credit card of the customer may be billed immediately for the complete order, when only a partial order has been filled. Testing must assure that partial order fulfillment and billing are done correctly.