Subway fare card machine decision diagram

This example of decision diagram for subway fare card machine was designed on the base of the Wikimedia Commons file: Subway Fare Card Machine Decision Diagram.jpg. "Decision/Action Diagrams - These diagrams are similar to functional flows except that decision points are added. Each function is expressed as a "verb-noun" combination with occasional adjectives or other modifiers. Each decision point is placed in a diamond-shaped outline symbol and written in question form. The question must be binary, answerable by a "yes" or "no" response. Both functional action blocks and decision diamonds are labeled with reference numbers, similar to those used for functional flow diagrams. These are necessary to ensure traceability." [commons.wikimedia.org/wiki/File:Subway_Fare_Card_Machine_Decision_Diagram.jpg] The example "Subway fare card machine decision diagram" was designed using ConceptDraw software extended with Decision Making solution from Management area of ConceptDraw Solution Park.