would drive good schooling 0 comes not just test scores but good schooling oakum the good schooling alfonse a much broader than test scores for math science and reading in the. i mean it's important impossible to. understand how much of a test scores cover but can you give us your hunch well we've been working hard at broadening the set of 0 comes and we call them the prosperity 0 comes so it includes not only academic achievement and attainment are poor kids going school but good measures of. student well being not just you know things like an outsider asian countries doing on measures of students well being i'm not sure in the most recent study but but no they're not always in the in the top 10 so there is a cost is there a realisation that there is a cost i think there is a cost i mean there's a lot of discussion about teen suicides and things like that but you also get that at the other extreme too are kids of very low scores but test scores aren't the right measure for that you know let me ask you a technical question because pieces run by the organisation for economic co-operation and