The second attempt at building a compiler therefore began with its formulation in the source language itself, which by that time had evolved into what was published as Pascal in 1970 [Wirth, 1970], The compiler was to be a single-pass system based on the proven top-down, recursive-descent principle for syntax analysis. We note here that this method was eligible because the ban against recursion had been lifted: recursivity of procedures was to be the normal case. The team of implementors consisted of U. Ammann, E. Marmier, and R. Schild. After the program was completed – a healthy experience in programming in an unimplemented language! – Schild was banished to his home for two weeks, the time it took him to translate the program into an auxiliary, low-level language available on the CDC computer. Thereafter, the bootstrapping process could begin [Wirth, 1971b]. This compiler was completed by mid 1970, and at this time the language definition was published. With the exception of some slight revisions in 1972, it remained stable thereafter.