1. A method for planning a multi-phase network, comprising: obtaining initial parameter values for parameters associated with first and second growth phases in a multi-phase network plan, the first and second growth phases representing different potential construction phases of the multi-phase network, wherein each of the first and second growth phases is characterized by sets of the parameters; calculating an initial growth scenario including the first and second growth phases based on the initial parameter values using a network planning device, the growth scenario representing a plan to implement the first and second growth phases in a first sequential order; adjusting a value for at least one of the parameters to produce a modified parameter value; automatically calculating a new growth scenario, to implement the first and second growth phases in a different second sequential order, based on the modified parameter value and at least a portion of the initial parameter values using the network planning device; and displaying the new growth scenario on a display.