Each CD provides 50 reading passages which come with 100 interactive drag-and-drop activities. Reinforce learning in comprehension vocabulary story maps and more. Essential standards-based activities come in three formats: matching sorting and sequencing. Activities are self-correcting providing immediate feedback to the student. Ideal for learning centers and individual computers as well as whiteboards. Developed to work on most interactive whiteboards including but not limited to SMART Promethean Mimio Starboard and Hitachi. Operating System Compatibility: Windows 2000 XP Vista MAC-G3 Macintosh OSX (10.2+) Software Compatibility: Flash Player 9 Java 1.4 Format: CD Rom Minimum Requirements: Windows-Intel Pentium III processor 256 MB available RAM 150 MB hard drive space available 16x CDROM drive.Unit of Measure : Each