Abstract: In Electronics, there exists three distinctive areas namely, discrete components or devices, circuits, and systems. A circuit is built from devices and a system is built from circuits. This invention aims at reducing the implementation of electronic systems down to just three steps namely, systems design, printed-circuit-board planar assembly, and systems test when-as a plurality of Universal Systems Printed-Circuit Blocks of pre-defined sizes is used. Each of said Universal Systems Printed-Circuit Blocks being usable and reusable for prototypes and production is built from a printed circuit board having thereon a functional circuit and a variety of circuit patterns and interconnection structures such that, any of said Blocks, when joined together with other Blocks on the same plane by standard connectors or electrically conductive compounds to form a systems board, can send and receive signals and voltages to and from any other Blocks.