To create an analogy to the map making planet, a block structure is comparable to a highway map of an whole nation. The major cities (functions) are listed but the minor county roads and city roads aren't. When troubleshooting, this elevated level map is useful in narrowing down and isolating where a issue or malfunction is.
A block diagram is a type of a method where the main parts or functions are represented by blocks joined by lines that reveal the connections of the blocks.
As an example, a block diagram of a wireless isn't expected to demonstrate each and every connection and dial and switch, however, the schematic diagram is. The schematic diagram of a wireless does not demonstrate the width of each link from the circuit board, however the layout diagram will not.
In process control, block diagrams are a visual vocabulary for describing activities within a intricate system in which blocks are black boxes that represent logical or mathematical operations that occur in sequence from left to right and top to bottom, but not the physical things, like processors or relays, that execute those operations. It's possible to create such cube diagrams and execute their functionality with technical programmable logic controller (PLC) programming languages.
Block diagrams rely on the principle of the black box where the contents are hidden from view to avoid being distracted by the details or because the details aren't known. We understand what goes in, we all know what happens, but we can not see the way the box does its work.
In biology there is a growing use of engineering fundamentals, techniques of analysis and methods of diagramming. There is a correlation between the block diagram and what is called Systems Biology Graphical Notation. As it is there's use created in systems economics of this cube diagram technique exploited by controller engineering where the latter itself is a program of control theory.
Block diagrams are generally used for higher degree, less detailed descriptions which are intended to describe general theories without consideration for the particulars of execution. Compare this with the design diagrams and design diagrams used in electrical engineering, which show the implementation information of electric elements and physical construction.
An example of that is the function block structure, among five programming languages defined in section 3 of the IEC 61131 (see IEC 61131-3) standard that is very formalized (see proper system), with strict rules to the diagrams should be assembled. Directed lines are used to link input variables to block input signal, and prevent outputs to output factors and inputs of other blocks.
In electrical engineering, a layout will often begin as a rather higher level block diagram, getting more and more detailed block diagrams because the design develops, finally ending in block diagrams detailed enough that every individual block can be easily implemented (at that point the block diagram can be also a schematic diagram). This is known as top down design.  Geometric shapes are frequently utilized in the diagram to help interpretation and describe meaning of this procedure or model. Each engineering field has their own meaning for every form. Block diagrams are used in every discipline of technology. They're also a valuable source of concept building and educationally beneficial in non-engineering disciplines.