Measurement
Case study methodology is designed to highlight outcomes of individual participants by
using multiple sources of data (Yin, 2003). The data sources utilized in this study included
two primary sources (a) videotapes of parent–child interaction and (b) parent report on
questionnaires and surveys. Moreover, in order to increase validity of findings, the parent
interaction outcomes were examined by two different sets of observers, each using a
different methodology. One observer coded interactions at a microanalytic level while the
other independently used a rating scale (i.e., JAFA) to score the interactions holistically.
Interrater reliability estimates were calculated for all measures by research assistants who
were unaware of the questions of the study.