Software Modeling and g Analysis Reading Log Softwares Chronic - - PowerPoint PPT Presentation

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Dec 17, 2022 179 likes •400 views

Software Modeling and g Analysis Reading Log Softwares Chronic Crisis by W. Wayt Gibbs y y from Scientific American 04 Overview Softwares Chronic Crisis Encountered Problems during Developing

SLIDE 1

Software Modeling and g Analysis

Reading Log ‘Software’s Chronic Crisis’ by W. Wayt Gibbs y y from Scientific American 경영정보 04 조대현

SLIDE 2

Overview

Software’s Chronic Crisis

Encountered Problems during

Developing Software, Systems

Examples Issues of Industrial growth

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Measurem ents of the su s o softw are

Measuring Quality of Software Guarantee of Consistency Guarantee of Consistency Predict budget and time expend

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Exam ple :

D i t Denver airport

Baggage-handling system

10 times bigger than Heathrow 20 different airlines

Failure! Failure!

Couldn’t perdict when it’s done Overcosts, Overdue.

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Study show s

s) s)

2560

n Points
n Points

Planned

2560 320

e (Functi e (Functi Actual

320 40

ject size
ject size

U.S. Average Project Schedule U.S. Average Cancellation Probability

10 20 30 40 50 60

Pro Pro

10 20 30 40 50

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SOURCE: Software Productivity Research

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Study show s

33% drawback rate..

6 large-scale software are put into

peration, while 2 are canceled

50% overdue rate.. 75% operation failures

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Solution: Set a Goal

“Softw are Engineering”

“the application of a systematic,

disciplined, quantifiable approach to the development, operation and maintenance of software.”

1968, NATO Science Committee 1968, NATO Science Committee

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Advance: Softw are Engineering

Measurements of quality of

ft software

Mathematical solutions

New Found Needs New Found Needs

Interchangeable,

bl f reusable software parts

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Advanced I ndustrial

Bigger

Doubled the code

More Elaborate

‘Clementine’ – DOD Safty-Critical Software

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Advanced I ndustrial ( 2 )

“distributed systems”

Programs that run cooperatively on

networked computers

System integration

Reusability Compatibility Reusability, Compatibility

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Exam ples p Distributed System

California’s Driver and Vehicle

R i t ti S t Registration System

Simple ?

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Exam ples p Distributed System ( 2 )

American Airlines

‘SABRE’

$2-billion flight reservation system

Flight Hotel Car integrated System Flight, Hotel, Car integrated System

Marriott, Hilton and Budget.

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I BM Research

24 Leading companies

Developed large distributed systems 55% Cost more than expected 68% Overran schedules 68% Overran schedules 88% Redesigned

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Tough to build

Distributed System

Complexity and Fragility Growing complexity Growing complexity “You can’t build skyscrapers using

carpenters.” carpenters.

Bill Curtis

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I BM Case

Advanced Automation System

(FAA) (FAA)

Great challenge of 90’s

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CMM

Capability Maturity Model (CMM)

Software Engineering Institute 1991 Five-level scale 261 organization rated 261 organization rated 75% - level 1 Mandated level 3 (U.S. Air Force,

NASA)

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Solutions

Beta Test

Microsoft, Windows

Proto Type

M th ti l F l th d

Mathematical Formal method

Praxis

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Solutions ( 2 )

Mathematical formal methods(2)

GEC – Train System in France

“Clean-room approach”

E i T l

Ericsson Telecom

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Further I ssues

Need More Supports Developing Software Componentes Developing Software Componentes

Profitability ?

B d C

Brad Cox

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Further I ssues

Varity uses of Software Parts Real Programmers should do Real Programmers should do.. Software development undergo

Industrial evolution. Industrial evolution.

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Farew ell!

Thank you For Listening.

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