We consider the effect on estimation of simultaneous variable centering and interaction effects in linear regression. We technically define, review, and amplify many of the statistical issues for interaction models with centering in order to create a useful and compact reference for teachers, students, and applied researchers. In addition, we…

Research on clients' perceptions of the acceptability of psychological treatments has grown out of concern for social validity and has resulted in the development of a hypothetical model to explain how individuals might select treatments. This model involves four components: (1) acceptability of treatment; (2) use of treatment; (3) integrity of…

Maternal behaviors within mother-infant games were examined to determine the amount, type, and functional value of maternal helping behaviors. A total of 17 mother-infant pairs were videotaped on monthly visits while playing five separate games. The study employed a skill-centered analysis to examine maternal scaffolding. (Author/RH)

Self-instructional booklets simulating computer-assisted instruction (CAI) were used to teach four basic concepts in science to first graders in three treatment groups which received different types of feedback--hints, correct answers, and right or wrong. A control group received neither instruction nor feedback. A multiple-choice test was…