There are several important limitations to the present study. This study was conducted
in a clinical setting and was not designed with control groups or multiple data collection
points due to restrictions imposed by the clinical agency. Second, the lack of a control
group prevents any conclusions regarding the efficacy of this intervention approach as the
outcomes reported in this studymay reflect children’smaturational changes.However, the
outcomes do point to the potential of measures for detecting change in this group of
children. Third, the number of children who participated in this study was small, and the
case study methodology necessitates more replications to corroborate the theoretical
direction of influence suggested by this intervention model (Yin, 2003). These
preliminary data suggest that children experience outcomes that are consistent with
the hypothesized intervention mechanisms. Fourth, multiple data points, in addition to
pretest and posttest filming, would have been helpful to help trace the development of
parental responsiveness and children’s interactional behaviour during the program period.
Case study methodology is strengthened when a series of data points is examined