This page demonstrates a key Lean concept: Mura, or variation. The simulator is based on a game described in Goldratt's The Goal (which is well worth reading). Click the help button to the right of the spinner to get an explanation of how the simulation works.

2 Comments

  1. Bernie Clark on April 11, 2017 at 11:56 pm

    Very nice, Allen. You always do good work. The Goal is an excellent book and this illustrates your point about work station averages nicely.
    I am not convinced that you can say this represents 5 back to back sprints, though. Subsequent sprint velocity is not constrained by prior sprint performance since stories are not passed ‘down the line’ as in a production process.

    I wonder if you will be doing a bottleneck simulator to demonstrate the effectiveness of WIP limits?

    • admin on September 2, 2017 at 3:45 pm

      Bernie — The sprint issue depends on whether or not the stories are dependent (i.e. you can’t release until you’ve completed a whole set of them). When they’re fully independent (as they should be if you’re following the INVEST criteria), normal averages kick in. When you have to complete a story before you can do the next one, then we have the dependent-variable situation demonstrated in the simulation.

      I’ve been pondering the notion of a WIP simulator, but I’m not sure what it would look like (other than a simulation of the coin-flip game). In the class, I was just going to get some friends to do the coin-flip exercise and record them. If anybody has a better idea, post it here!

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