The peculiarities of the design, development and operation of the decision-making support system SPOR are considered. The architecture of the system is presented and the choice of the system implementation language is justified. Two functionally oriented environments of the system SPOR are considered, each of which is aimed at solving specialized tasks of creating and processing electronic action plans. The functional capabilities of the component subsystems of these environments are analyzed in detail and the expediency of using the decision-making support system SPOR to solve the problems of operational management of emergency response in situational centers is substantiated.