TY  - BOOK
AU  - Gropper,George Leonard
TI  - Diagnosis and revision in the development of instructional materials
SN  - 0877780838
U1  - 371.3078 
PY  - 1975///
CY  - Englewood Cliffs, N.J.
PB  - Educational Technology Publications
KW  - Teaching
KW  - Aids and devices
KW  - Local
KW  - Programmed Instruction
N1  - Includes index; Bibliography: p. 193-195
ER  -