| ALGOL 60 Modified | ⊕ 1977 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL60s | ⊕ International | 1970 final revision of ALGOL 60 |
| ALGOL 68S | ⊕ 1977 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL68s | ⊕ International | Simplified version of ALGOL 68 |
| EBNF | ⊕ 1977 | ⊕ International | Extended BNF | ||
| FORTRAN 77 | ⊕ 1977 | ↓ ↑ ⊕ Numerical Scientific | ⊕ International |