Understanding the domain All of the levels for each measure follow a progression from preschool (on the left), to early first grade (on the right), like on the DRDP-K (2015) instrument. The DRDP-K (2015) instrument represents the developmental levels as equal intervals. Figure 1. Developmental progression for a sample measure. A group of measures forms each domain. Each domain scale reflects the psychometric transformation of the developmental levels of the measures within that domain into a scale that is based on the data collected during the calibration studies. Figure 2. Measures form a domain. Developmental levels on a domain scale that are represented with wider bars will typically take longer for children to master than developmental levels that are represented with thinner bars. The domain scale represents an overall developmental progression; however, it may take more or less time for an individual child to master a level. Figure 3. Illustration of how developmental levels are represented by different widths.
Understanding the domain All of the levels for each measure follow a progression from preschool (on the left), to early first grade (on the right), like on the DRDP-K (2015) instrument. The DRDP-K (2015) instrument represents the developmental levels as equal intervals. Figure 1. Developmental progression for a sample measure. A group of measures forms each domain. Each domain scale reflects the psychometric transformation of the developmental levels of the measures within that domain into a scale that is based on the data collected during the calibration studies. Figure 2. Measures form a domain. Developmental levels on a domain scale that are represented with wider bars will typically take longer for children to master than developmental levels that are represented with thinner bars. The domain scale represents an overall developmental progression; however, it may take more or less time for an individual child to master a level. Figure 3. Illustration of how developmental levels are represented by different widths.
DRDP2015GroupReportGuidance_for_K_CAv2.docx