1、 INCITS/ISO 5807-1985 (R2003)(formerly ANSI/ISO 5807-1985 (R1998)for Information Processing -Documentation Symbols andConventions for Data,Program and System Flowcharts,Program Network Charts andSystem Resources ChartsANSI/IS0 5807-l 985 American National Standard for Information Processing- Documen
2、tation Symbols and Conventions for Data, Program and System Flowcharts, Program Network Charts and System Resources Charts Secretariat Computer and Business Equipment Manufacturers Association Approved February 27, 1991 American National Standards Institute, Inc. AmericanNationalStandardApproval of
3、an American National Standard requires review by ANSI that therequirements for due process, consensus, and other criteria for approval havebeen met by the standards developer.Consensus is established when, in the judgment of the ANSI Board of StandardsReview, substantial agreement has been reached b
4、y directly and materiallyaffected interests. Substantial agreement means much more than a simplemajority, but not necessarily unanimity. Consensus requires that all views andobjections be considered, and that a concerted effort be made toward theirresolution.The use of American National Standards is
5、 completely voluntary; their existencedoes not in any respect preclude anyone, whether he has approved the standardsor not, from manufacturing, marketing, purchasing, or using products, processes,or procedures not conforming to the standards.The American National Standards Institute does not develop
6、 standards and will inno circumstances give an interpretation of any American National Standard.Moreover, no person shall have the right or authority to issue an interpretation ofan American National Standard in the name of the American National StandardsInstitute. Requests for interpretations shoul
7、d be addressed to the secretariat orsponsor whose name appears on the title page of this standard.CAUTION NOTICE: This American National Standard may be revised orwithdrawn at any time. The procedures of the American National StandardsInstitute require that action be taken periodically to reaffirm,
8、revise, or withdrawthis standard. Purchasers of American National Standards may receive currentinformation on all standards by calling or writing the American National StandardsInstitute.Published byAmerican National Standards Institute11 West 42nd Street, New York, New York 10036Copyright 1985 by I
9、nformation Technology Industry Council (ITI)All rights reserved.These materials are subject to copyright claims of International Standardization Organization (ISO),American National Standards Institute (ANSI), and Information Technology Industry Council (ITI). Not forresale. No part of this publicat
10、ion may be reproduced in any form, including an electronic retrieval system,without the prior written permission of ITI. All requests pertaining to this standard should be submitted toITI, 1250 Eye Street NW, Washington, DC 20005.Printed in the United States of AmericaForeword (This foreword is not
11、part of American National Standard ANSI/IS0 5807-l 985. This document is identical to ISO/IEC 5807-l 985 and the following three paragraphs are the original foreword as it appeared in that document.) IS0 (the International Organization for Standardization) is a worldwide fed- eration of national sta
12、ndards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 techni- cal committees. Each member body interested in a subject for which a tech- nical committee has been established has the right to be represented on that committee. Internationa
13、l organizations, governmental and non-governmen- tal, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are cir- culated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. They are
14、approved in accor- dance with IS0 procedures requiring at least 75% approval by the member bodies voting. International Standard IS0 5807 was prepared by Technical Committee ISO/TC 97, information processing systems. Requests for interpretation, suggestions for improvement or addenda, or defect repo
15、rts are welcome. They should be sent to the X3 Secretariat, Computer and Business Equipment Manufacturers Association, 1250 Eye Street, NW, Suite 200, Washington, DC 20005. This standard was processed and approved for submittal to ANSI by Accredited Standards Committee on Information Processing Syst
16、ems, X3. Committee approval of the standard does not necessarily imply that all committee members voted for its approval. At the time it approved this standard, the X3 Committee had the following members: Richard Gibson, Chair Donald C. Loughry, Vice-Chair Joanne Flanagan, Secretary Organization Rep
17、resented Name of Representative Allen-Bradley Company . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ronald Reimer Joe Lenner (Alt.) American Library Association . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18、 . . . . . Paul Peters American Nuclear Society . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Geraldine C. Main Sally Hartzell (Alt.) AMP, Inc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19、. . . . . . . . . . . . . . . . . . . . . . . Edward Kelly Edward Mikoski (Alt.) Apple Computer, Inc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Karen Higginbottom Association of the Institute for Certification of Computer Profes
20、sionals (AICCP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Kenneth Zemrowski Eugene Dwyer (Alt.) AT the number of levels depending on the size and complexity of the information processing problem. The level of detail should be such that the various parts and the interrelat
21、ionship between the parts are comprehensible as a whole. Typically there will be a chart of the whole system showing the main constituent parts and this will form the top of a hierarchy of charts; each lower level providing a more detailed descrip- tion of one or more parts shown on the next higher
22、level chart. 1 Scope and field of application This International Standard specifies symbols to be used in in- formation processing documentation and gives guidance on the conventions for their use in a) data flowcharts: b) program flowcharts; c) system flowcharts; d) program network charts; e) syste
23、m resources charts. 2 Reference IS0 2382/l, Data processing - Vocabulary - Part 01: Fun- damen tal terms. 1 ) 3 Definitions For the purpose of this International Standard the definitions in IS0 2382/l and the following apply. 3.1 basic symbol: Symbol used when the precise nature or form of, for exam
24、ple, the process or data media is not known or when it is not necessary to depict the actual medium. 3.2 specific symbol : Symbol used when the precise nature or form of, for example, the process or data media is known and when it is necessary to depict the actual medium. 3.3 flowchart: Graphical re
25、presentation of the definition, analysis, or method of solution of a problem in which symbols are used to represent operations, data, flow, equipment, etc. 4 Data flowchart Data flowcharts represent the path of data in the solving of a problem and define processing steps as well as the various data
26、media used. A data flowchart consists of a) data symbols to indicate the existence of data; they may also indicate the medium used for this data; b) process symbols to indicate the process to be executed on data; they may also indicate the machine function which is used for this process; c) line sym
27、bols to indicate the data flow between pro- cesses and/or data media; d) special symbols to facilitate the reading and the writing of the flowchart. 1) At present at the stage of draft. (Revision of IS0 2382/l-1974.) 1 ANSI/IS0 5807-l 985 By definition, process symbols should be preceded and fol- lo
28、wed by data symbols. A data flowchart begins and ends with data symbols (except special symbols as specified in 9.4). 5 Program flowchart Program flowcharts represent the sequence of operations in a program. A program flowchart consists of 6 a) process symbols for the actual processing operations in
29、cluding symbols that define the path to be followed taking into account the logical conditions; b) line symbols to indicate the flow of control; c) special symbols to facilitate the reading and the writing of the flowchart. System flowchart System flowcharts represent the control of operations and t
30、he data flow of a system. A system flowchart consists of a) data symbols to indicate the existence of data; they may also indicate the medium used for this data; b) process symbols to indicate the operations to be executed on data, as well as to define the logical path to be followed; c) line symbol
31、s to indicate data flow between processes end/or data media as well as the control flow between processes; d) special symbols to facilitate the reading and writing of the flowchart. 7 Program network chart Program network charts represent the path of program acti- vations and the interactions to rel
32、ated data. Each program in a program network chart is shown only once, whereas in a system flowchart it may appear in more than one control fiow. A program network chart consists of a) data symbols to indicate the existence of data; b) process symbols to indicate the operations to be executed on dat
33、a; cl line symbols to show the flow between processes and data as well as the activations of processes; d) special symbols to facilitate the reading and writing of the network charts. 8 System resources chart System resources charts represent the configuration of data units and process units suitabl
34、e for the solving of a problem or of a set of problems. A system resources chart consists of a) data symbols to show input, output or storage devices; b) process symbols to represent processors, for example, central processing units, channels, etc. ; c) line symbols to represent the data transfer be
35、tween data devices and processors and control transfer between processors; d) special symbols to facilitate the reading and the writing of the system resources chart. 9 Symbols 9.1 Data symbols 9.1.1 Basic data symbols 9.1.1.1 Data This symbol represents data, the medium being unspecified 9.1.1.2 St
36、ored data This symbol represents stored data in a form suitable for pro- cessing, the medium being unspecified. u 9.1.2 Specific data symbols 9.1.2.1 Internal storage 2 ANSI/IS0 5807-l 985 This symbol represents data, the medium being internal storage. 111 9.1.2.2 Sequential accass storage This symb
37、ol represents data that is only sequentially accessible, the medium being, for example, magnetic tape, tape cartridge, tape cassette. 0 9.1.2.3 Direct access storage This symbol represents data directly accessible, the medium being, for example, magnetic disk, drum, flexible disk. 9.1.2.4 Document T
38、his symbol represents human readable data, the medium being, for example, printed output, an OCR or MICR docu- ment, microfilm, tally roll, data entry forms. 9.1.2.5 Manual input This symbol represents data, the medium being of any type where the information is entered manually at the time of pro- c
39、essing, for example, on-line keyboard, switch settings, push buttons, light pen, bar-code wand. 9.1.2.6 Card This symbol represents data, the medium being cards, for example, punched cards, magnetic cards, mark sense cards, stub cards, mark scan cards. 9.1.2.7 Punched tape This symbol represents dat
40、a, the medium being paper tape. 9.1.2.8 Display This symbol represents data, the medium being of any type where the information is displayed for human use, for example, video screens, on-line indicators. 0 9.2 Process symbols 9.2.1 Basic process symbol Process This symbol represents any kind of proc
41、essing function, for example, executing a defined operation or group of operations resulting in a change in value, form or location of information, or in the determination of which one of several flow directions is to be followed. 3 ANSl/lSO5807-1985 Specific process symbols 9.2.2 9.2.2. 1 Predefine
42、d process This symbol represents a named process consisting of one or more operations or program steps that are specified elsewhere, for example, a subroutine, a module. Eli 9.2.2.2 Manual operation This symbol represents any process performed by a human being. T-7 9.2.2.3 Preparation This symbol re
43、presents modification of an instruction or group of instructions in order to affect some subsequent activity, for example, setting a switch, modifying an index register or in- itializing a routine. 0 9.2.2.4 Decision This symbol represents a decision or switching type function having a single entry
44、but where there may be a number of alter- native exits, one and only one of which may be activated following the evaluation of conditions defined within the sym- bol. The appropriate results of the evaluation may be written adjacent to the lines representing the paths (see 10.3.1.2) 0 4 ANSI/IS0 580
45、7-l 985 9.2.2.5 Parallel mode This symbol represents the synchronization of two or more parallel operations. , , B C cl b . . F NOTE - Processes C, D and E cannot commence until process A has been completed; similarly process F should await completion of B, C and D; but process C may stat-t and/or e
46、nd before process D has started and/or ended respectively. ANSI/IS0 5807-l 985 9.2.2.6 Loop limit This symbol, in two parts, represents the beginning and end of a loop. The two parts of the symbol have the same identifier. The con- ditions for initialiition, increment, termination, etc., appear insi
47、de the symbol at the beginning or at the end according to the location of the test operation. n I 9.3 Line symbols I Loop name Termination condition Process Process 9.3.1 Basic line symbol tine This symbol represents the flow of data or control. Solid or open arrowheads shall ba added to indicate di
48、rection of flow where necessary (see 10.2.1.2) or may be added to enhance the readability. 9.3.2 Specific line symbols 9.3.2.1 Control transfer This symbol represents immediate transfer of control from one process to another, sometimes with a chance of the direct return to the activating process aft
49、ar the activated process completes its actions. The type of control transfer should be named inside the symbol, for example, call, fetch, avent. D 6 ANSI/IS0 5807-l 985 9.3.2.2 Communication link This symbol represents data transfer by a telecommunication link. 9.3.2.3 Dashed line This symbol represents an alternative relationship between two or more symbols. The symbol is also used to surround an annotated area (see 9.4.31. - ANSI/IS0 5807-l 985 Examples : a) in cases where one of a number of alternative outputs is used as an input to a process, or an output is used as an input for alte
