A method and system for enabling performance of a transaction. A first representation of a transaction policy, which depicts transaction policy options for fulfilling the transaction policy is displayed by a client computer. After a user selects a first transaction policy option, the client computer displays a second representation of the transaction policy, depicting at least one mechanism pertaining to the first transaction policy option for satisfying the requirements of the first transaction policy option. After the user selects a first mechanism, the client computer displays evidence options for each requirement of the first transaction policy option. After the user selects an evidence option for each requirement of the first transaction policy option, the client computer sends to a server transaction enablement information that includes evidence dictated by the selected evidence options to enable the server to perform the transaction.