The Trees 2 Program for Macintosh Users

Trees is a computer program (© Sean Crist and Anthony Kroch) that helps students learn the basics of syntactic structure and transformational derivations. The program is used in courses at the University of Pennsylvania and elsewhere. It is also used for drawing trees for display in word processing documents and on web pages.

Trees 2 for Macintosh runs under OS 8/9 and in the classic environment under OS X.

Trees was developed under a grant from the University of Pennsylvania School of Arts and Sciences Instructional Computing Development Fund and is freely available to Penn students and staff. Others who wish to use it must do so under a license.

If you are not affiliated with an institution that has a site license for Trees, you may download a demo of the current version of Trees for the Macintosh [version 2.1.3a], including a demonstration grammar and a MS Word file of instructions on how to use the program. This file is in binhex format and must be converted by "StuffIt Expander" or a similar program. If your Web browser is configured to use the conversion program as a "helper" application, the conversion will happen automatically.

The demo version is a full-featured version of the program, which will run for 30 days. If you want to keep using Trees after that time, you must purchase the program. The cost of registration for an individual user is $25.

Purchases can be made in two ways:

1. By check denominated in US dollars payable at a US bank to "Anthony Kroch" sent to the address below.
2. By credit card from the global internet reseller Kagi®.

Multiple user site licenses are also available at higher cost for instructors who want to use the program for teaching purposes. These licenses cover both the Macintosh and the Windows versions of the program. For further information on the cost and conditions of a site license, click here.

Newly registered users of Trees for the Macintosh only:

If you have purchased the program, click here to download the registration package, which includes:

1. a copy of the grammar writing manual
2. a set of sample grammars
3. a grammar for making trees for papers ( click here for an animated demonstration)
4. 60 days of email support for help in writing grammars

The downloadable registration package archive is encrypted and the required password is supplied on purchase.