"Investigations in Math and Science AB" is an annual science elective for students in grades 7-12 in Los Angeles Unified School District. Section 1 of this guide provides teachers with a discussion of the course content, including the course description, representative objectives, required instructional units, and enrichment activities. Basic skills to be mastered include the communication skills of speaking, listening, reading and writing; reasoning; problem solving; computation skills; and performance skills. The second section discusses lesson planning and instruction for the course and includes: (1) a list of teacher responsibilities; (2) a model for the teacher-directed lesson process; (3) an agenda format for daily activities; (4) questions and commentary for teaching decisions; (5) a suggested lesson plan format; (6) questions and vocabulary to promote higher levels of thinking; (7) steps to assist students in the problem-solving and decision-making process; (8) suggestions of ways to improve student thinking; (9) suggestions to improve students' self-image and self-worth; and (10) guidelines for assigning homework. The appendix lists resources available to district teachers. (MDH)