This booklet is the eighth in a series of nine from the Teacher Training Institute at Hofstra University (New York) and contains descriptive information about two courses included in the institute's program. The first course, by David Knee, William McKeough, and Robert Silverstone, is "Discrete Mathematical Models," which deals with topics from graph theory, set theory, logic, combinatorics, probability theory, statistics, and finite algebraic structures. The second course, by Joyce Bernstein and William McKeough, is "Spreadsheets in the Classroom" and focuses on spreadsheet-based conjecturing and problem solving activities involving geometric properties, number theoretic principles, conditional probability, trigonometric relations, and graphing capabilities. For each course this booklet includes: (1) the course description and requirements; (2) the pretest/posttest, the midterm assignment, and the final examination; (3) course handouts for various projects and assignments; (4) sample project results from some of the participants; and (5) a proposal by a participant for an inservice peer group workshop. (JJK)