1. A computer-implemented method for adaptive planning of a transportation service comprising: sending a transportation proposal to a plurality of organizations, the proposal including a set of initial options, each initial option including a set of variable parameters for specifying a transportation service; with a computer processor, providing a graphical user interface for each organization to select values for one or more of the variable parameters to generate at least one modified option, and for making a commitment for at least one of the modified options, conditional on the organization-selected values for the variable parameters; providing for each organization to send respective modified options to commuters of that organization and visualizing pledges received from the commuters for each of the modified options on a graphical interface; receiving responses to the modified transportation proposal, at least some of the responses including pledges by the commuters for at least one of the modified options based on the organization-selected values for the variable parameters and, where selected, on commuter-selected values for the variable parameters; with a computer processor, computing a cost-benefit function for each of a set of revised options for the transportation service, each of the revised options being based on a combination of the variable parameters for which pledges which cover the combination have been received, the computing the cost benefit function comprising computing for each of the set of revised options for a predetermined time period, a function of: a total value of the pledges for that revised option, where each revised option has a different combination of parameter values or ranges of the parameter values, a cost of the revised option to the transport provider, which is a function of the parameter values or ranges for that revised option, and a benefit to the transport provider; and with a computer processor, outputting at least one of the revised options based on the cost-benefit function to a graphical user interface displayed on a display device.