HERE'S A TEST: How much are schools spending on assessments? Data from 20 companies participating in the Software & Information Industry Association's (SIIA) annual vendor survey shows that the PreK-12 testing and assessment market has grown 57% over the past three years. Sales of these products totaled almost $2.5 billion in 2012-13, making them "the largest single category of education technology sales," according to the executive summary (PDF). Among the drivers of this growth is Common Core testing and increasing demand for better digital formative assessments. The full 20+ page report will set you back $350.