The simplification in block diagrams may also be useful when demonstrating an idea, but concealing the internal workings of possibly secret intellectual property (IP). Top-down design in electrical engineering frequently progresses through progressively detailed block diagrams. After a detail is added through iterations, the block structure becomes a schematic. Block diagrams in process control reveal the functions of surgeries but not the components that play them. The functions of block diagrams can then be implemented using programmable logic controls (PLC).
Contrary to schematics, blueprints and design diagrams, block diagrams don't portray the necessary detail for physical construction. Block diagrams are made easy so as to not cloud concepts.
Block diagrams are also used in a context. In the analysis of math, for example, block diagrams have been utilized to display biological functions and interrelations.
An entity relationship diagram (ERD), one case of a block structure, represents an info system by demonstrating the relationships between humans, objects, places, events or theories within that system. (See an image over the ERD definition page.)
Block diagrams are utilized heavily in engineering and design of diagrams for software, hardware, electronics and processes. Most frequently, they signify theories and systems in a greater degree, less thorough summary. The diagrams are helpful for troubleshooting technical issues.