How might one use an IGDI to monitor program progress?

Program progress using IGDI's is represented by the aggregation of all individual IGDI data within a single indicator, say early communication for example. In order to accurately reflect program progress, care must be taken to represent the range of children and ages in the aggregated program sample. Aggregating all children, or drawing a representative sample of children, ensures an accurate accounting of program outcomes. Program progress overall is then reflected by the mean rate of growth for all children measured frequently and at standard ages. Within the sample, breakdowns of the number and percentage of children at or below expectation are possible and used to inform discussions of strategies for improving the program and children's progress.