We start this part of the analysis with the proposition that a duty of reasonable care owed by a tortfeasor to an injured party is elemental to any recovery in negligence. Unlike foreseeability and causation, which are issues generally and more suitably entrusted to fact finder adjudication, the definition of the existence and scope of an alleged tortfeasor’s duty is usually a legal, policy-laden declaration reserved for Judges to make prior to submitting anything to fact-finding or jury consideration. Common-law experience teaches that duty is not something derived or discerned from an algebraic formula. Rather, it coalesces from vectored forces including logic, science, weighty competing socioeconomic policies and sometimes contractual assumptions of responsibility. These sources contribute to pinpointing and apportioning of societal risks and to an allocation of burdens of loss and reparation on a fair, prudent basis