OPS3 | ⊕ 1979 | ↓ ↑ ⊕ Specialised Languages | ⊕ RETE and production | ⊕ United States | Official Production System version 3 |
OPS4 | ⊕ 1979 | ↓ ↑ ⊕ Specialised Languages | ⊕ RETE and production | ⊕ United States | Official Production System version 4 |
OPS5 | ⊕ 1979 | ↓ ↑ ⊕ Specialised Languages | ⊕ RETE and production | ⊕ United States | Official Production System version 5 |