Another early programming language was devised by Grace Hopper in the US, called FLOW-MATIC. It was developed for the UNIVAC I at Remington Rand during the period from 1955 until 1959. Hopper found that business data processing customers were uncomfortable with mathematical notation, and in early 1955, she and her team wrote a specification for an English programming language and implemented a prototype.[29] The FLOW-MATIC compiler became publicly available in early 1958 and was substantially complete in 1959.[30] Flow-Matic was a major influence in the design of COBOL, since only it and its direct descendent AIMACO were in actual use at the time.[31] The language Fortran was developed at IBM in the mid '50s, and became the first widely used high-level general purpose programming language.