One of the strongest selling points of Visio 2013 Professional is how it plays with other Microsoft products of the same era:
In Standard Visio, your flowchart is just a drawing. In Professional, you can define rules. The feature checks your processes against defined business rules (e.g., "Every decision node must have two outgoing arrows" or "No infinite loops allowed"). This is essential for Six Sigma and ISO compliance documentation. microsoft visio 2013 professional