DISTAR's an acronym for Direct Instruction System for Teaching Arithmetic and Reading, a trademarked program of SRA/McGraw-Hill, a commercial publishing company. The program's used particularly for historically disadvantaged and/or at-risk students. DISTAR Reading has been extensively expanded and rebranded by SRA/McGraw-Hill as Reading Mastery while DISTAR Arithmetic I and II are still available (DISTAR Arithmetic III's out of print). DISTAR Language I and II have been updated and renamed Langu… (More on Distar)