the main menu without completing all the exercises, but the commands indicated in the manual did not work for this reviewer. The programs provide ernn messages and keep track of student performance within a particular program. H w w e r , there is nc, function t o provide student or instructor with a record of the student's performance in each of several different programs. Some messages were displayed on the screen for too short a time to be read and understood. There is apparently no way t o move from the programs on disk 1 to disk 2 without turning the computer off and hack on again. Entering an answer with other than the desired number of significant figures produced prompts that varied from program t o program. The backspace arrow is functional in the programs hut is not mentioned anywhere. The programs t o calculate a straight line by linear regression, t o calculate the mean, standard deviation, and 95 percent and 99 percent confidence limits of s set of data, each can handle up t o 50 pairs of values. Entry of more data caused the system to crash. A more serious problem area was the display, which did not generally include lower case letters or sub- or superscripts. The keyboard input did not always work with this limitation in a logical manner. For example, iron (11) chloride was displayed as FEC12 rather than FeCI2. The program did not accept keyboard input of FeC12 as a correct entry; instead this was scored as an incorrect answer, and only keyboard input of FEC12 was correct. The presentation of numbers in scientific notation uses standard conventions: 3 . 3 . 10Pisdi~playedssR.3 X 10 '-5, but this conventim is n
