A semi-schematic diagram combines a number of the abstraction of a purely schematic diagram with other elements exhibited as realistically as possible, for various reasons.
In electrical and electronic industry, a design diagram is often utilised to refer to the plan of gear. Schematic diagrams are often employed for the maintenance and repair of electronic and electromechanical systems.  Original schematics were done by hand, using standardized templates or off-the-shelf adhesive symbols, but now electronic design automation applications (EDA or"electric CAD") is often utilized.
A schematic, or schematic diagram, would be a representation of the components of a system using abstract, graphic symbols instead of realistic images. A schematic usually omits all details that aren't pertinent to the information the schematic is intended to convey, and may add unrealistic components that assist understanding. By way of example, a subway map intended for passengers can represent a subway station with a dot; the dot does not resemble the actual station whatsoever but gives the viewer info without unnecessary visual clutter. A schematic diagram of a compound process utilizes symbols to represent the valves, ducts, valvesand pumps, and other equipment of the system, emphasizing their interconnection paths and suppressing physical details. In a digital circuit diagram, the layout of these symbols may not resemble the design in the circuit. In the design diagram, the emblematic components are organized to be easily interpreted by the viewer.
These programs go beyond simple drawing of connections and devices. Normally they are incorporated into the whole IC design flow and linked to other EDA tools for verification and simulation of this circuit under design.
In electrical power systems layout, a design drawing referred to as a one-line diagram is frequently utilised to symbolize substations, distribution methods as well as whole electric power grids. All these diagrams compress and simplify the facts which would be repeated on each individual stage of a three-phase system, showing only one component rather than three. Electrical diagrams such as switchgear frequently have common device functions designate by standard function amounts.
Schematic diagrams have been used extensively in repair manuals to help users understand the interconnections of parts, and to offer graphical training to help out with rebuilding and simplifying mechanical assemblies. Lots of automotive and motorcycle repair manuals give a substantial number of webpages into schematic diagrams.
In electronic design automation, before the 1980s schematics were almost the only formal representation for circuits. More recently, together with the progress of computer technology, other specimens were introduced and technical computer languages have been developed, as with all the explosive growth of the complexity of digital circuits, traditional schematics are becoming less practical. By way of instance, hardware description languages are indispensable for modern digital circuit design.