Normal - University of Waterloo
Transcript of Normal - University of Waterloo
![Page 1: Normal - University of Waterloo](https://reader034.fdocuments.in/reader034/viewer/2022042214/62597c710f99433f2679ff35/html5/thumbnails/1.jpg)
Normal
![Page 2: Normal - University of Waterloo](https://reader034.fdocuments.in/reader034/viewer/2022042214/62597c710f99433f2679ff35/html5/thumbnails/2.jpg)
Normal Radical
A Spectrum of Engineering Design
![Page 3: Normal - University of Waterloo](https://reader034.fdocuments.in/reader034/viewer/2022042214/62597c710f99433f2679ff35/html5/thumbnails/3.jpg)
Normal Radical
A Spectrum of Engineering Design
![Page 4: Normal - University of Waterloo](https://reader034.fdocuments.in/reader034/viewer/2022042214/62597c710f99433f2679ff35/html5/thumbnails/4.jpg)
Characterizing the Spectrum
Normal
• ?
Radical
• ?
![Page 5: Normal - University of Waterloo](https://reader034.fdocuments.in/reader034/viewer/2022042214/62597c710f99433f2679ff35/html5/thumbnails/5.jpg)
Characterizing the Spectrum
Normal
• expect to work in a wide variety of well-understood cases
Radical
• hope it works in 3 cases
![Page 6: Normal - University of Waterloo](https://reader034.fdocuments.in/reader034/viewer/2022042214/62597c710f99433f2679ff35/html5/thumbnails/6.jpg)
Characterizing the Spectrum
Normal
• reduced risk
• reduced cost
• easier communication
• easier maintenance
• shorter development time
Radical
• innovation is expensive and time consuming
• harder requirements elicitation
• harder verification
![Page 7: Normal - University of Waterloo](https://reader034.fdocuments.in/reader034/viewer/2022042214/62597c710f99433f2679ff35/html5/thumbnails/7.jpg)
Sez who?
• Michael A. JacksonThe Name & Nature of Software Engineering
• Walter G. VincentiWhat Engineers Know and How They Know It
• Edward W. ConstantThe Origins of The TurboJet Revolution
![Page 8: Normal - University of Waterloo](https://reader034.fdocuments.in/reader034/viewer/2022042214/62597c710f99433f2679ff35/html5/thumbnails/8.jpg)
A Space of Engineering Design
Normal
Radical
composition
com
pone
nts
![Page 9: Normal - University of Waterloo](https://reader034.fdocuments.in/reader034/viewer/2022042214/62597c710f99433f2679ff35/html5/thumbnails/9.jpg)
SE2 is about normal modes of composition.
Most of the other courses that you’ve taken so farhave been about normal components: e.g.,
databases, compilers, operating systems, etc.(or basic skills, e.g. math)
![Page 10: Normal - University of Waterloo](https://reader034.fdocuments.in/reader034/viewer/2022042214/62597c710f99433f2679ff35/html5/thumbnails/10.jpg)
There are two ways of constructing a software design.
• One way is to make it so simple that there are obviously no deficiencies.
• And the other way is to make it so complicated that there are no obvious deficiencies.
C.A.R. HoareTuring Award Speech, 1980
![Page 11: Normal - University of Waterloo](https://reader034.fdocuments.in/reader034/viewer/2022042214/62597c710f99433f2679ff35/html5/thumbnails/11.jpg)
Design DisciplinesPart II
![Page 12: Normal - University of Waterloo](https://reader034.fdocuments.in/reader034/viewer/2022042214/62597c710f99433f2679ff35/html5/thumbnails/12.jpg)
Is there something common amongst the design disciplines?
![Page 13: Normal - University of Waterloo](https://reader034.fdocuments.in/reader034/viewer/2022042214/62597c710f99433f2679ff35/html5/thumbnails/13.jpg)
IDEO
![Page 14: Normal - University of Waterloo](https://reader034.fdocuments.in/reader034/viewer/2022042214/62597c710f99433f2679ff35/html5/thumbnails/14.jpg)
Conceptual
PhysicalH
um
an
Tech
nica
l
![Page 15: Normal - University of Waterloo](https://reader034.fdocuments.in/reader034/viewer/2022042214/62597c710f99433f2679ff35/html5/thumbnails/15.jpg)
Conceptual
PhysicalH
um
an
Tech
nica
l
Industrial
Graphic
Web
Interaction
H.C.I.
Ergo. Process E.
Mech. E.
Physics
CSHardware E.
Software E.
![Page 16: Normal - University of Waterloo](https://reader034.fdocuments.in/reader034/viewer/2022042214/62597c710f99433f2679ff35/html5/thumbnails/16.jpg)
Definitions
• The fundamental organization of a system, embodied in its components, their relationships to each other and the environment, and the principles governing its design and evolution.
• A plan for arranging elements in such a way as to best accomplish a particular purpose.
![Page 17: Normal - University of Waterloo](https://reader034.fdocuments.in/reader034/viewer/2022042214/62597c710f99433f2679ff35/html5/thumbnails/17.jpg)
Design ProcessPart III
![Page 18: Normal - University of Waterloo](https://reader034.fdocuments.in/reader034/viewer/2022042214/62597c710f99433f2679ff35/html5/thumbnails/18.jpg)
The Design Process
1. Ideation
2. Analysis
3. Selection
4. Elaboration
Iterate
![Page 19: Normal - University of Waterloo](https://reader034.fdocuments.in/reader034/viewer/2022042214/62597c710f99433f2679ff35/html5/thumbnails/19.jpg)
How to get new ideas?
• try a different architectural style
• relax a constraint
• change the technology
• re-imagine the problem
• draw inspiration from another problem/soln
• try a different point on the Pareto-front
![Page 20: Normal - University of Waterloo](https://reader034.fdocuments.in/reader034/viewer/2022042214/62597c710f99433f2679ff35/html5/thumbnails/20.jpg)
Criteria for Analysis
• Fitness for Purpose
• Fitness for Future
• Production Cost
• Operating Cost
![Page 21: Normal - University of Waterloo](https://reader034.fdocuments.in/reader034/viewer/2022042214/62597c710f99433f2679ff35/html5/thumbnails/21.jpg)
Characterizing Fitness for Purpose
• Absence of deadlocks
• ACID
• Book checked out by at most one patron
• Linked-list is acyclic
• etc.
![Page 22: Normal - University of Waterloo](https://reader034.fdocuments.in/reader034/viewer/2022042214/62597c710f99433f2679ff35/html5/thumbnails/22.jpg)
Analyzing Fitness for Purpose
• Other engineering disciplines use math.
• We can use it too!
• Model-checking
• Queuing theory
• etc.
![Page 23: Normal - University of Waterloo](https://reader034.fdocuments.in/reader034/viewer/2022042214/62597c710f99433f2679ff35/html5/thumbnails/23.jpg)
Comparative Analysis
![Page 24: Normal - University of Waterloo](https://reader034.fdocuments.in/reader034/viewer/2022042214/62597c710f99433f2679ff35/html5/thumbnails/24.jpg)
Comparative Analysis
Spee
d
Cost
dominatedsolutions
![Page 25: Normal - University of Waterloo](https://reader034.fdocuments.in/reader034/viewer/2022042214/62597c710f99433f2679ff35/html5/thumbnails/25.jpg)
The Pareto Front
• The set of non-dominated solutions/designs.
• aka Pareto-Optimal, Pareto-Efficient designs
• N.B.:
• the design space is partially ordered
• not totally ordered!
![Page 26: Normal - University of Waterloo](https://reader034.fdocuments.in/reader034/viewer/2022042214/62597c710f99433f2679ff35/html5/thumbnails/26.jpg)
Summary
• Normal vs Radical Design
• Commonalities amongst Design Disciplines
• The Design Process
• Ideation
• Single Design Analysis: Fitness for Purpose
• Comparative Design Analysis: Pareto Front
math!
math!
crea
tivity