OKLAHOMA CITY (AP) — Oklahoma Attorney General Scott Pruitt has opened an inquiry into glitches in end of instruction examinations for Oklahoma schoolchildren in the last school year. Pruitt sent a letter to state school superintendents on Monday seeking details about how their districts were affected by multiple failures from testing vendor CTB/McGraw-Hill that Pruitt says resulted in non-performance under its contract with the state. Pruitt says he wants to know the number of students affected by the disruptions, the school districts affected, the length of time the disruptions continued and their impact on parents. The letter says Pruitt wants to establish the cause and effect of the glitches and establish accountability and potential damages. The Board of Education has voted to terminate CTB/McGraw Hill's contract after back-to-back years of disruptions during standardized testing.