The role of IT is becoming more prominent in people's daily lives and the authors are becoming increasingly dependent on computers. More and more business transactions are being automated, for example, ordering a book at an online bookstore or transferring money to a bank account in another part of the world. No matter the type of transaction, they want it to be accurate and they want to have no doubts about its outcome. Transactions are also becoming more complex, driven by new ways of conducting business and new technologies. Smartphone's now allow one to conduct transactions anywhere and at anytime.