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An algebraic approach to correctness verification of graphical software specifications is presented. LACATRE graphical language based on multitasking and providing real-time functions is considered as a specification tool. The verification process is distributed into four stages. The two initial ones are related to a translation of LACATRE specification into lower description level (Communicating Real-Time State Machines). ; The third stage deals with a generation of the process in the form of a graph of states and automatic relative correctness verification. The fourth stage is related to correctness verification for user-defined criteria. The proposed verification method examines the relative correctness concept introduced in former papers.