This document consists of 170 microcomputer software package evaluations prepared by the MicroSIFT (Microcomputer Software and Information for Teachers) Clearinghouse at the Northwest Regional Education Laboratory. Set 11 consists of 37 packages. Set 12 consists of 34 packages. A special unnumbered set, entitled LIBRA Reviews, treats 99 packages designed for Junior High School Science courses. Each software review lists source, cost, ability level, subject, topic, transfer medium, required hardware, required software, instructional purpose, instructional techniques, documentation, instructional objectives (stated), instructional prerequisites (inferred), content, structure, estimated student time required, potential uses, major strengths, and major weaknesses. An evaluation summary rates each package on 21 criteria. The titles of the packages evaluated in sets 11 and 12 are as follows: Algebra Drill and Practice II; Alien Action; Basic English Skills--Sentences; Basic Number Facts (PLATO); Basic Programming; Capitalization Plus; Classify; Cloze-Plus, Level H; Computer Literacy Adventures of the Lollipop Dragon; Creating Your Own Greeting Cards; Diascriptive Reading I; Early Games for Young Children; Early Games--Fraction Factory; Early Games--Matchmaker; Early Games--Music; Early Games--Piece of Cake; Electric English Lessons; Floppy Teaches Same and Different; Floppy Teaches What Is Missing; Introductory Algebra; Key Lingo; Keyboarding for Information (PLATO); Logic and Euclidean Geometry; Logic Gates; Math 1-2-3 Four Pack--Counting; Mathfish; Processing Power Program, Level E; Quizagon; Rails West!; The Reef of Gold; Scholastic Spelling--Levels 3-6; Special Products and Algebraic Factors; Speed/Bingo Math; Stickybear ABC; The Medalists--States; U.S. Constitution Tutor; and Vectors and Graphing, Volume 1; Alabama Arcade; Alligator Alley; Beginning Composition; Budgeting Simulation; Budgeting Tutorial; Charged Particles II; Circuit Lab; Composition Strategy; Electronic Blackboard Series: Alabama; The Electronic Study Guide -- System of Equations and Inequalities; Four-Letter Words; Idea Invasion; Kinematics II; Letter Man; Number Bowling/Space Journey; Numeration 1; Numeration 2; Nutrition Simulation; Nutrition Tutorial; Orbit II; Picnic; Projectiles II; Pyramid Puzzler; Ship Ahoy/Word Scramble; Star Maze; Tellstar; That's My Story; Tribbles; Typing Strategy; Vector Addition II; Wave Addition II; Wiz Works; Mathematics Life Skills, Volume 2: World of Work; 50 Defense vs Run. (LMM)