"TreePlan helps you build a decision tree diagram in an Excel worksheet using dialog boxes." Thayer School MEM courses use TreePlan. The TreePlan Excel add-in works both on Windows and Macintosh computers (Mac installation instructions are in the downloadable User Guide,).


Thayer School students have several options for access to TreePlan:

  • Run it in MacLean room 210.
  • Run it on a Thayer School Loaner Laptop.
  • Get it loaded on their personal/research machine.


TreePlan can be installed by a support person in MacLean room 126.


A User Guide, Tryout and examples are available for download from

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