Leppien (education, U. of Great Falls) and Purcell, a consultant to the Connecticut State Department of Education for gifted and talented education, collect lessons and curriculum units from math educators for teachers of students in grades 6 through 12, to complement their books on the Parallel Curriculum Model. Lessons are organized into units on fractions, linear programming, similarity and relationships, and quadratic relationships, and are aimed at specific grades, with ideas for differentiation, connections between math and other subjects, the parallel that is emphasized (core curriculum or curriculums of connections, practice, or identity), the content framework, and assessments. Annotation ©2011 Book News, Inc., Portland, OR (booknews.com)