Systems, methods, and other embodiments associated with the generation and execution of analytical models are described. In one embodiment, a computer-implemented method includes identifying a selected runtime environment for executing an analytical model that includes analytical expressions. A user-script data structure is generated and provides mapping of the analytical expressions to executable expressions of the runtime environment. A computerized specification object is generated that includes a pre-script data structure, the user-script data structure with the analytical model, and a post-script data structure. The pre-script data structure specifies how the runtime environment is to access input data to be operated upon by the analytical model. The post-script data structure specifies how to output results data, produced by the analytical model, from the runtime environment. The computerized specification object is transmitted over a computer network to the runtime environment for execution of the analytical model in the runtime environment.