A method for creating user-defined computer operations involves drawing an arrow in response to user input and associating at least one graphic to the arrow to designate a transaction to the arrow. The transaction is designated to the arrow after analyzing the graphic object and the arrow to determine if the transaction is valid for the arrow. The transaction may be validated or invalidated for the arrow using a second arrow. Furthermore, the second arrow may be used to modify the transaction for the arrow. The context for creating the modified transaction may be recorded for subsequent use.