Nato 1968 software engineering report PDF

Title	Nato 1968 software engineering report
Course	Software Engineering
Institution	University of Essex
Pages	136
File Size	1.8 MB
File Type	PDF
Total Downloads	10
Total Views	139

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Nato 1968 software engineering report...

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SOFTWARE ENGINEERING

Report on a conference sponsored by the NATO SCIENCE COMMITTEE Garmisch, Germany, 7th to 11th October 1968

Chairman: Professor Dr. F. L. Bauer Co-chairmen: Professor L. Bolliet, Dr. H. J. Helms

Editors: Peter Naur and Brian Randell

January 1969

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NATO SOFTWARE ENGINEERING CONFERENCE 1968

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2. Software Engineering and Society

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2. Software Engineering and Society

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3. Software Engineering

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RESOURCES (men, $)

UNIT TEST

RELEASE

CUSTOMER UTILIZATION

SYSTEM TEST

UNIT DEVELOPMENT COMPONENT UNIT DESIGN DESIGN SYSTEM DESIGN STUDY

TECHNICAL SUPPORT SYSTEM DESIGN

( Machine operations, production services, support programs, analysis, etc. )

MAINTENANCE AND FOLLOW-UP

DOCUMENTATION TEST DEVELOPMENT CONTROL AND ADMINISTRATION PROJECT INITIATION

TIME THE SYSTEM DEVELOPMENT PROCESS PHASE AND FUNCTIONS Figure 1. From Nash: Some problems in the production of large-scale software systems.

3. Software Engineering

NATO SOFTWARE ENGINEERING CONFERENCE 1968

COMPONENT TEST

AN ERROR-PRONE TRANSLATION PROCESS

COMPLETE SYSTEM SPECIFICATION

PROBLEM RECOGNITION

ANALYSIS

DESIGN

DESCRIPTION OF PROBLEM

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IDENTIFIES PROBLEM AND PRODUCES FIRST TENTATIVE DESIGN

SYSTEM ACCEPTANCE

IMPLEMENTATION

COMPLETELY OPERATIONAL SYSTEM

INSTALLATION

MAINTENANCE

CORRECTS AND MODIFIES SYSTEM

WORKING SYSTEM DETERMINES FORM AND METHOD OF SYSTEM

OBSOLESCENCE

ADAPTS SYSTEM TO ENVIRONMENT

TRADITIONAL CONCEPTS OF PROGRAMMING COVER THIS SPAN IN PRACTICE PROGRAMMERS PERFORM DUTIES OVER THIS SPAN SCHEMATIC FOR THE TOTAL PROGRAMMING (SOFTWARE SYSTEM-BUILDING) PROCESS Figure 2. From Selig: Documentation for service and users. Originally due to Constantine.

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3. Software Engineering

Application programs Middleware Service Routines Compilers

Control prog.

Assemblers

Figure 3. d’Agapeyeff’s Inverted Pyramid

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3. Software Engineering

PROG UNITS

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NO. OF PROGRAMMERS

YRS

MAN YEARS

PROG WORDS

WORDS MAN YR

Operational

50

83

4

101

52,000

515

Maintenance

36

60

4

81

51,000

630

Compiler

13

9

21/4

17

38,000

2230

Translation Data Assembler

15

13

21/2

11

25,000

2270

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3. Software Engineering

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WORDS IN THOUSANDS

50

40

30 LEGEND 20

ESTIMATED PROG SIZE PREDICTED ACTUAL

0

JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEPT. OCT. NOV. DEC. JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEPT. OCT. NOV. DEC.

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1963

1964

SCHEDULE OF WRITING SUCCASUNNA CALL PROGRAM (WRITTEN – NOT DEBUGGED)

Figure 4. From Harr: The design and production of real-time software for Electronic Switching Systems.

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3. Software Engineering

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WORDS IN THOUSANDS

50

40 TOTAL ESTIMATED WORDS

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20

WORDS DEBUGGED ON SYSTEM

LEGEND ESTIMATED PROG SIZE PREDICTED ACTUAL

0

JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEPT. OCT. NOV. DEC. JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEPT. OCT. NOV. DEC.

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1963

1964

SCHEDULE OF DEBUGGING SUCCASUNNA CALL PROGRAMS

Figure 5. From Harr: The design and production of real-time software for Electronic Switching Systems.

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3. Software Engineering

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3. Software Engineering

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4. Design

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4. Design

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4. Design

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4. Design

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4. Design

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4. Design

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4. Design

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4. Design

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4. Design

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4. Design

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4. Design

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4. Design

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4. Design

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4. Design

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4. Design

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5. Production

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5. Production

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5. Production

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5. Production

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5. Production

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5. Production

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5. Production

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PROBABILITY THAT T=t

} NON-FEASIBLE } BREAK THROUGH OPTIMISTIC

T TIME (t)

MOST LIKELY

50/50 CHANCE TO ACHIEVE

PESSIMISTIC

} CATASTROPHY (FIRE) PROJECT ESTIMATION

Figure 8. From Nash: Some problems of management in the production of large-scale software systems.

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5. Production

NOTE

= TIME OF ESTIMATE

THE PROBABILITY DISTRIBUTION AS A FUNCTION OF TIME OF ESTIMATE Figure 9. From Nash: Some problems of management in the production of large-scale software systems.

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5. Production

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CUMULATIVE NORMAL DISTRIBUTION Figure 10. From Nash: Some problems of management in the production of large-scale software systems.

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0.4 0.6 0.8 1.0 1.3 1.5 1.7 2.0 2.7

3.0 3.5 4.0 4.5 5.0 6.0 8.0 12.0 15.0 20.0

SELECTED BETA CURVES Figure 11. From Nash: Some problems of management in the production of large-scale software systems.

5. Production

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5. Production

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130 120 110 B

100 90 A 80 70 60 50 40 30 20 10

5

AUG. 12 19 26

2

SEPT. 9 16 23

30

7

OCT. 14 21 28

4

NOV. DEC. 11 18 25 2

TEST BUCKET PROJECTION Figure 12. From Nash: Some problems of management in the production of large-scale software systems.

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5. Production

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5. Production

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5. Production

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6. Service

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6. Service

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6. Service

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6. Service

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6. Service

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6. Service

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7. Special Topics

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8. Invited Addresses

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8. Invited Addresses

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9. Working Papers

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Appendices

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Appendices

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Appendices

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Appendices

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Appendices

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Appendices

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Appendices

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Contributor Index

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Subject Index

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Subject Index

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Subject Index

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