A glance at the historical development shows that electrochemical engineering became a technical science of its own through the last decades. Principles of optimization and economic evaluation are involved reducing the physical laws to a common denominator, money, un order to perform a quantitative analysis of alternative and optimal routes. Scientific investigations open a window on future techniques of metalplating by pulsating current. Developemnts in cell design made electrochemical processing quite attractive and competitive to conventional routes, e.g. for waste water treatment.