Flow & Suzuki: Total correctnes of parallel programs.- Jones: Development of interfering programs.- Lamport: Verification of concurrent programs.- Owicki & Gries: Verification of parallel programs.- Apt, Francez & de Roever: Verification of CSP.- Barringer & Mearns: Verification of Ada Tasks.- Levin & Gries: Verification of CSP.- Misra & Chandy: Proofs of process networks.- Zhou & Hoare: Correctness of communicating processes.- Conclusions.