A method and apparatus for depicting grid availability at various times and for illustrating a simulation of the way in which a grid project will be executed based on grid availability. In addition, the affects of introducing new nodes into the grid may be determined and the affects on the simulated behavior of the grid with regard to the running of a grid project may be depicted using the graphical user interface. From this information, a user may determine the optimal time to initiate processing of a grid project by the computing grid.