Types of Flowcharts

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Types of Flowchart
The system designer and programmer often use three different types of flowcharts in developing algorithms; They are:
  1.  System flowcharts
  2.  Modular program flowchart
  3. Detail program flowcharts or application flowcharts
While the three flowcharts are related service a different function.
  1. System flowchart-  System flowchart play a vital role in system analysis. They illustrate graphically the elements and characteristics of a system and express its structure and relationships in terms of flowchart symbols. This chart describes the sequences of major processing operations both manual and computer, data flow and files to be used in processing and the flow of processing control. System flowchart is used by systems analysts for analysing or designing system.
              During the problem recognition stage, they illustrate data flow and relationship in the existing system. During the system design stage, they allow the analyst to conveniently experiment with alternative data flow plans. They provide graphic records to serve as guides during the implementation of a modified or newly designed business system.
              During the evaluation stage of system analysis, system flowchart reflects the changes and alternations made. They again provide an opportunity for testing alternatives and possible variations. The implemented, working system will be documented in a system flowchart that is carefully drawn, accurate, and comprehensive.
  2. Modular Program Flowchart:- Modular program flowchart is designed primarily to illustrate algorithms for developing and writing a sequence of instructions that perform each procedure or operation is written as an independent unit or module. This module is capable of performing that procedure in other programs as well. Specific details on how a given operation is to be done are not included. Only the relationship and sequence of processes are illustrated.
                This type of flowchart, sometimes referred to as block diagram, is advantageous because it allows the programmer to concentrate on designing the major floe of logic in the program and temporarily ignore the computer level details. One may experiment with alternate algorithms without a great expenditure of time or effort. The modular flowchart is excellent for communicating the major thread of logic followed in a program. The algorithm is not obscured by numerous minute details.
                This flowchart This flowchart differs from the system flowchart in that the systems flow chart indicates the hardware independence identifies the files and show the general flow of data whereas the modular program flowchart defines the logical steps involved in the input-output and processing of information.
  3. Detail Program Flowchart:- Detailed program flowchart are the most comprehensive and element chart used by the programmers.Each symbol represents an executable step suitable for coding as an instruction in a computer language. The detailed steps shown in a detail program flowchart may vary slightly when coding in different languages. This is because each language may perform an operation in a slightly different manner or at a different level of sophistication. The major steps in the program logic followed will usually be the same for all languages however in the details program flowchart each details minute step on operation is shown in its correct sequence reduced used to its simplest components. 
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