Thoroughness - The number of assessments that have been made for the selected child/group/staff's key children throughout the selected time period. Please note that this is likely to be different to the number of observations you have made as there will probably be times when you add several assessments to a single observation.
Attainment - Average number of months the child is assessed at minus their age. Their assessed age is actually a range – either the whole age band if you don’t use refinements, or a third of the age band if you do use refinements. For example, if a child was assessed as 30-50 months secure, the range would be 43-50 months. If they were, say, 44 months old, their attainment would be 0 because they are 0 months away from being in that age bracket. If however, they were 55 months old, they would be -5 because they would be that far away from being in the bracket. If they were 42 months old, their attainment would be 1 because that’s how far they are away from being in the age band.
Progress - The difference between attainments of the selected period. If a child is shown to have minus progress, that doesn't mean necessarily they're actually getting worse, but rather they aren't progressing in real terms (i.e. at the same rate as they're aging). For example if a child's attainment was 3 in the first term, and 1 in the second term, their progress would be -2. Even though their attainment is still above where you would expect it to be for a child of their age, their progress is a negative number, because their attainment isn't as far above where you expect it to be as in the previous term.
Hopefully this graph showing the top and bottom end of each age band and refinement will help you to visualise how attainment (and thus progress) are calculated.
It shows the child's actual age on the y axis and the age bands on the x axis.
For a child's attainment to be 0, you would need to be able to draw a line up from their assessed age and along from their actual age, and have them meet in between the two lines on the graph.
For example a 25 month old child could be in either 16-26 Secure, or 22-36 Emerging.
This table shows the top and bottom end of each age band and refinement segment (it's the same information as the graph, it's just in a different format). Please note that you can click on both the table and the graph to make them bigger.