Prepositions! Sterling Edition is a language and vocabulary tutorial program designed for use by children with autism, developmental disabilities, or language-learning disabilities. This program helps children master essential prepositions. Six modules cover ten prepositions in developmental order: in, on, under, above, below, in front of, in back of, next to, and between. Three-dimensional characters and objects illustrate the prepositions while keeping students focused and engaged in the learning process. Using Optimized Intervention technology, the program begins with an assessment and then continually adjusts the lesson delivery based on a student's responses to provide individualized intervention. The program collects data to document student performance and provides built-in reports on students' learning activities over time. COMPATIBILITY: For use with Macintosh and IBM and compatible computers. SYSTEM REQUIREMENTS: The Windows version requires a 300 megaHertz (MHz) processor or higher; hard drive with Windows 98, ME, NT, 2000, XP or later; 64 megabytes (MB) RAM; 40 MB available disk space; a Windows compatible sound card; and an 8x speed CD-ROM. The Macintosh version requires a PowerPC with a 300 MHz or higher processor; Mac OS 8.1 or later, including OS X; 128 MB RAM (256 MB RAM for OS X); 40 MB available disk space; and an 8x speed CD-ROM drive.