RM School) that, in 12 weeks of 14-hour instructional days, covered the basics of electrical engineering, including the related mathematics; this was initially given by a number of engineering colleges and universities. Primary was followed by a Secondary School (officially called Advanced Radio Materiel School), giving advanced theory and laboratory work on actual hardware; several new Navy-operated schools, including an upgraded RMS, provided this instruction. The ETP was reported to be the most intense and difficult technical instruction ever given to enlisted personnel. Therefore, the Eddy Test needed to identify students with the basic capability and psychological fitness to pursue such instruction. The test was noted to have been very successful for this purpose. January 12, 1942, a prototype Primary School was opened using laboratories of Eddy's experimental television station in the "Loop" of downtown Chicago. Initial students were admitted on the basis of prior radio experience, and were also tested against a draft of the Eddy Test. The prototype school quickly evolved into an extensive operation called Radio Chicago; its functions included centralized grading all of the Eddy Tests. Eddy and his staff wrote a book to help people prepare for the test. Even after filtering with the Eddy Test, there was initially an unacceptably high failure rate in Primary School; thus, Radio Chicago added a 4-week Pre-Radio School, concentrating on physics, mathematics, and the slide rule, conducted by taking over several local junior colleges and high schools. There are no records of the number of people taking the Eddy Test during WW II, but this is estimated to have been 500,000 or more. In an interview, Eddy stated that 86,000 persons "received training", possibly indicating that this number passed the test. Captain Eddy's Legion of Merit citation states that through 1945 some 30,000 technicians completed the ETP. These numbers show that only a small fraction initially passed the Eddy Test, and that, even with this, the failure rate in the overall program was some 60 percent. There was a hard, universally used pass-fail criterion for the Eddy Test, and a second chance was normally never allowed. Eddy described the test as having questions with multiple-choice answers, with each of the answers giving some indication of the test-taker's mathematics/physics knowledge, creativity, reasoning ability, and general aptitude. Most answers were weighted – not simply right or wrong – and speed certainly affected the results. No copies of the actual test