1. C.D.U.Curriculum Development Unit Bulletin Number 48. Wellington: Government Printer, 1973.
2. HARLEN, W.Science 5–13: A formative evaluation. London: Macmillan Educational, 1975.
3. KLOPFER, L.E. Evaluation of learning in science. In Bloom, B.S. et al.Handbook of Formative and Summative Evaluation of student learning. New York: McGraw-Hill, 1971.
4. OSBORNE, R.J. & FREYBERG, P.S. The systems approach and its application to curriculum research.Research in Science Education, 1977,7, 71–81.