1. A computer-implemented land planning system designed to generate at least one conceptual cost-optimized solution to a non linear land development problem, said system comprising: means for electronically creating at least one candidate solution to the non linear land development problem, said candidate solution comprising a plurality of interrelated engineering cost measurements applicable in development of an undeveloped land site, and said plurality of engineering cost measurements being selected from a group consisting of demolition, clearing, grubbing, excavation, fill placement, retaining walls, erosion control, grading, parking lot design, access roads, curbs, gutters, asphalt, landscaping, drop inlets, manholes, piping, storm water collection, sanitary sewer collection, and potable water system; means for employing an iterative, heuristic problem-solving strategy utilizing non linear processes to manipulate the engineering cost measurements of said candidate solution and achieve at least one cost-optimized solution to the non linear land development problem, whereby a change to one of said plurality of engineering cost measurements for said candidate solution effects a change to another of said plurality of engineering cost measurements for that candidate solution; and means for illustrating said cost-optimized solution to the non linear land development problem.