In process management, block diagrams are a visual language for describing activities within a intricate system in which blocks are black boxes which represent logical or mathematical operations which exist in order from left to right and top to bottom, but not the physical things, like chips or relays, that execute these operations. It's likely to make such block diagrams and execute their performance with specialized programmable logic controller (PLC) programming languages.
As an example, a block diagram of a wireless is not predicted to show each and every connection and dial and switch, but the design diagram is. The design of a wireless does not show the width of each link from the printed circuit board, however the layout diagram does.
The significant towns (serves ) are recorded but the small county roads and city roads are not. After troubleshooting, this high degree map is helpful in narrowing down and isolating where a issue or fault is.
In electrical engineering, a style will often start as a rather large level block diagram, getting increasingly more detailed block diagrams as the design progresses, finally finishing in block diagrams detailed enough that every individual block is readily executed (at which point the block diagram can be also a schematic diagram). This is referred to as top down design.  Geometric shapes are often utilized at the diagram to help interpretation and describe meaning of the procedure or model. The geometric shapes are linked by lines to signify association and direction/order of traversal. Each engineering discipline has their own meaning for each form. Block diagrams are employed in each discipline of engineering. They are also a valuable source of concept building and educationally valuable in non-engineering disciplines.
In biology there's an increasing use of engineering fundamentals, techniques of research and ways of diagramming. There is some correlation between the block structure and what is called Systems Biology Graphical Notation. Since it is there is use created in systems economics of the block structure technique harnessed by control technology in which the latter itself is a program of control theory.
Block diagrams are usually used for higher level, less comprehensive descriptions which are meant to describe general theories without consideration for the specifics of implementation. Compare this with the design diagrams and layout diagrams used in electrical engineering, which reveal the implementation details of electric elements and physical structure.
A good example of this is that the function block structure, one of five programming languages defined in section 3 of this IEC 61131 (see IEC 61131-3) benchmark that's very formalized (see proper system), with strict rules for how diagrams are to be assembled. Directed lines have been utilized to link input variables to block input signal, and block outputs to output variables and inputs of other blocks.
Block diagrams rely on the principle of the black box where the contents are hidden from view either to avoid being distracted by the details because the details aren't known. We know what happens, we all know what happens, but we can't see how the box does its work.
A block diagram is a diagram of a method in which the principal components or functions are represented by cubes joined by lines which reveal the relationships of the cubes. They are greatly utilized in technology in hardware design, electronic design, software design, and process flow diagrams.