Object Mentor Blog: The Post-itÂ® Notes Test for UML Diagrams

The Post-itÂ® Notes Test for UML Diagrams

Dean Wampler — Tue, 22 Jan 2008 15:58:00 -0600

A lot of teams require their developers to document their designs in UML, using Visio or another tool, before they can start coding.

Of course, this is not at all Agile. For one thing, the design is likely to change quite a bit as you learn while coding. Hardly anyone returns to the diagrams and updates them. Now they are lies, because they make claims about the designs that aren’t true.

UML still has a place in agile projects, of course. It’s a great tool for brainstorming design ideas. So, how do you decide when a diagram is worth keeping and therefore, worth maintaining? Here’s a little strategy that I recommend.

Draw the diagram during those brainstorming sessions on a white board or a poster-sized Post-it® Note. Drawing it this way means you have invested almost no additional effort, beyond the brainstorming itself, to create the diagram. Also, you won’t feel bad about lost work if you eventually throw it away.

Leave the diagram on the wall for everyone to see while they implement the design.

By the time the note is falling off the wall or the dry-erase marker is wearing off the white board, you’ll know if the ideas are still relevant or completely obsolete.

If they are obsolete, you can erase the board or toss the paper. If they are still relevant, and probably changed somewhat, you now know that the diagram is worth preserving. Go ahead and spend the time to create an updated, more permanent version in your drawing tool (but don’t spend too much time!).

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