AbstractGet full access to this articleView all access options for this article.Get accessReferences1. Popham, W.J. (1988). Educational Evaluation (2nd ed.). Englewood Cliffs, NJ: Prentice-Hall.2. Wolery, M. and Bailey, D.B. (1984). Alternatives to impact evaluations: Suggestions for program evaluation in early intervention. Journal of the Division for Early Childhood, 9 (1), 27-37.
