XL Tree® 3.0

XLTree is a Decision Tree add-in for Excel 2016 or higher. It was originally developed for Decision Making with Insight, a textbook on management science by Dr. Sam L. Savage. Version 3.0 has been updated to include a Tool Ribbon, and capacity limited only by the size of Excel.

The XLTree ribbon

The XLTree ribbon

IMPORTANT NOTE: After downloading the XLTree add-in file, it may be necessary to "unblock" it before using it with Excel. To do this:

  1. Right-click on the XLTree XLAM file to open the pop-up menu.

  2. At the bottom of the pop-up menu, select the Properties option to open the Properties dialog.

  3. The Properties dialog should have a check-box near the bottom saying "Unblock.” Check this box and press OK. (If you don't see the "unblock" check-box, then the file is already unblocked.)

    XLTree can be used on a temporary basis by opening the XLTree XLAM file the same way you would open any Excel file, for instance, by double-clicking the XLAM file. This will load the XLTree add-in into Excel for your current Excel session only. If you use XLTree this way, then XLTree will not be loaded the next time you open Excel, but you can re-open it to load the add-in again.

To install XLTree so it automatically loads every time you start Excel:

  1. Open any Excel worksheet (even a blank one.)

  2. Press Alt-t-i to open the add-in manager dialog. (Step 1 is required for the Alt-t-i command to work.)

  3. Press the Browse... button and browse to the XLTree XLAM file.

  4. Click on the XLTree file and press OK. Make sure the add-ins manager now has an entry for XLTree, with a check mark next to it.

  5. Press OK in the add-in manager dialog. XLTree should now automatically open when you start Excel.


This should install XLTree on your computer.

If you have a Mac, the procedure to open the add-in manager is slightly different:

  1. Click the Tools menu

  2. Select the Excel Add-ins... menu item

  3. proceed as in 3-5 above.