As an instructor of mathematics for the women "computers" at the Moore School of Electrical Engineering, Goldstine also trained some of the six women who were the original programmers of ENIAC to manually calculate ballistic trajectories (complex differential calculations). The job of computer was critical to the war effort, and women were regarded as capable of doing the work more rapidly and accurately than men. By 1943, and for the balance of World War II, essentially all computers were women as were many of their direct supervisors.