A good example of that is the function block diagram, one of five programming languages defined in section 3 of this IEC 61131 (see IEC 61131-3) standard that is highly formalized (see formal method ), with strict rules to how diagrams should be assembled. Directed lines have been utilized to connect input factors to block input signal, and prevent outputs to output variables and inputs of other blocks.
As an example, a block diagram of a radio is not expected to demonstrate each and every link and dial and change, however, the schematic diagram is. The design of a radio does not show the width of each connection in the printed circuit board, however, the layout diagram does.
In biology there is an increasing use of engineering fundamentals, techniques of analysis and methods of diagramming. There is some correlation between the block diagram and what's named Systems Biology Graphical Notation. As it is there is use created in systems biology of this cube structure technique exploited by controller engineering in which the latter itself is a program of management theory.
Block diagrams are generally used for higher degree, less detailed descriptions which are meant to clarify overall concepts without consideration for the particulars of implementation. Contrast this with the design diagrams and design diagrams used in electrical engineering, which reveal the implementation information of electric components and physical construction.
In process control, block diagrams are a visual language for describing actions within a complex system where blocks are black boxes that represent logical or mathematical operations which exist in sequence from left to right and top to bottom, although not the physical things, such as processors or radiators, that execute these operations. It is likely to make such block diagrams and execute their functionality with technical programmable logic controller (PLC) programming languages. )
In electrical engineering, a layout will often start as a quite large level block structure, becoming increasingly more detailed block diagrams as the design develops, eventually ending in block diagrams detailed enough that each individual block can be readily implemented (at that point the block structure is also a schematic diagram). This is known as top down style.  Geometric shapes are frequently used at the diagram to aid interpretation and clarify meaning of this process or model. Each engineering discipline has their own significance for each shape. Block diagrams are employed in every discipline of technology. They are also a valuable source of concept building and educationally valuable in non-engineering disciplines.
A block diagram is a diagram of a method where the principal components or functions are represented by cubes connected by lines which reveal the connections of the cubes.
The significant towns (serves ) are recorded but the minor county roads and city streets aren't. When troubleshooting, this high level map is useful in narrowing down and isolating in which a issue or malfunction is.
Block diagrams rely on the principle of the black box in which the contents are concealed from view to avoid being distracted by the facts because the details are not known. We understand what happens, we know what goes out, but we can't see how the box does its work.