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Research on early intervention programs which involve parents in their children's education shows that parental involvement has no significant bearing on children's academic achievement. Because most early intervention programs use parents as supplementary intervenors, it cannot and should not be claimed that such programs offer greater benefits for children, are cost effective, lengthen effect duration or provide benefits for other siblings. Furthermore, more research is necessary since current research on these programs are not methodologically thorough and the parents' roles are not of primary focus.

Summary.-The purpose of this study was to test the effectiveness of two techniques for increasing response rates to mailed questionnaires, namely, type of covering letter salutation (handwritten vs typed) and return postage (metered vs nonmetered). Surveys were sent to 300 randomly selected members of the National Council for Measurement in Education. A 2 x 2 factorial analysis of variance showed typed salutations were more effective than handwritten salutations in eliciting responses from this professional population. No differences in response rates were found between metered and nonmetered return envelopes.