Decision table is a way to decision making that involves different condition of business role and the relationships of their outcomes. Both conditions and action is list as row of the table, the table shows the possible outcome of when a action is taken within certain circumstance. For example, Willard's VIP program offers variety choices of voucher for their VIP members. If a gold VIP member spent over $2,000 per purchase, he will earn $100 Voucher. So as you can see on the table. Gold Member and Spent Over $2,000 is "YES", the result of these two conditions are satisfied is $100 Voucher. Decision table is a effective way to show those kinds of business rule with a very easy understandable table. Decision table represents and discovers business logic, which ultimately lead to better business.