Development on the Hurd began in 1990 after an abandoned kernel attempt in 1986, based on the research TRIX operating system developed by Professor Steve Ward and his group at MIT's Laboratory for Computer Science (LCS). According to Thomas Bushnell, the initial Hurd architect, their early plan was to adapt the 4.4BSD-Lite kernel and, in hindsight, "It is now perfectly obvious to me that this would have succeeded splendidly and the world would be a very different place today." In 1987 Richard Stallman proposed using the Mach microkernel developed by Richard Rashid at Carnegie Mellon University. Work on this was delayed for three years due to uncertainty over whether CMU would release the Mach code under a suitable license.