Abstract: A method includes, based on information received from a user through a graphical user interface, forming and storing elements that define a model that can be run by a computer to simulate operation of a real-world system that includes real-world features. The method includes including in the elements that are formed and stored, collections of software entities that correspond to the real-world features, and running the model using the software entities.

Abstract: A method includes, based on information received from a user through a graphical user interface, forming and storing elements that define a model that can be run by a computer to simulate operation of a real-world system that includes real-world features. The method includes including in the elements that are formed and stored, collections of software entities that correspond to the real-world features, and running the model using the software entities.

Abstract: A method includes, based on information received from a user through a graphical user interface, forming and storing elements that define a model that can be run by a computer to simulate operation of a real-world system that includes real-world features. The method includes including in the elements that are formed and stored, collections of software entities that correspond to the real-world features, and running the model using the software entities.

Abstract: A method includes, based on information received from a user through a graphical user interface, forming and storing elements that define a model that can be run by a computer to simulate operation of a real-world system that includes real-world features. The method includes including in the elements that are formed and stored, collections of software entities that correspond to the real-world features, and running the model using the software entities.

Abstract: A computer-based method for aiding a user to develop a computer-based simulation model of the kind which simulates a multiple variable system using a suite of equations. Stored, user-entered constraint knowledge defines possible conditions of variables of the multiple variable system and corresponding expected consequences on variables of the system. The possible conditions are automatically applied to the suite of equations to produce test consequences on variables of the system. Then the test consequences are automatically analyzed against the expected consequences as an indication of the validity of the simulation model.

Abstract: In a data processing system employed for simulation, a simulation program (24) produces simulation results (26), while a pre-compiler (18) used to prepare the simulation program (24) generates cause and effect lists (22). The cause and effect lists (22) and simulation results (26) are organized in data groups associated with the various variables in the model. A presentation module (28) operates a display (16) so as to display variable names (37) that represent the data groups and icons (32, 34, 36, 38, 40, 42, and 44) that represent operations that can be performed on the data groups. By using a mouse (15) to "click on" a data-group name (48) and an icon (40-55, 59), the user can cause a selected data-group operation to be performed on a selected data group.