1. Objects and Design Summer 2002
Introduction to CS2340
Objects and Design
Summer 2002

2. This Semester
Instructor: Barbara Ericson,

3. Books this Semester Required Text Optional
Guzdial: Squeak: Object-oriented design with multimedia applications
Optional
Goldberg & Robson: Smalltalk-80: The Language (“Purple Book”) - Addison-Wesley
Guzdial & Rose (Eds): Squeak, Open Personal Computing and Multimedia

4. Content of Class Focus on OOA, OOD, OOP
OOA: CRC Cards
OOD: UML Class Diagrams
OOP: Squeak
User interfaces: Building, design, evaluation
Cap of languages focus (follow-on to Languages and Translation)

5. Structure of Class You have a major, team-based project
Summer 2002: Build an objects-based drawing editor with ability to output and input a subset of Postscript
Lectures are here to provide you with theory, examples, issues
BUT DO COME! Huge differences in grades…

6. Grading Policy 25% Midterm 10% Quizzes (3) 30% Final
In-class, open-book, minutes
30% Final
35% Project Assignments (5 of them)

7. Resources CoWeb: http://coweb.cc.gatech.edu/cs2340/
Newsgroup: git.cc.class.2340
TAs hang out there
No guarantee of 24-hour coverage, nor late night (nor early morning!) coverage

8. Where to get Squeak, lecture notes…
On the CoWeb…
We’ll be using Squeak 3.2 (latest version, not what’s on your CD, but what’s on your CD should work.)
Lecture notes are all on the book CD with updates loaded to CoWeb.

9. On the CoWeb… Definition of project
Milestones (Turn-ins) - ALL OF THEM
Roughly every two weeks
First one is individualized, all others are team-based
First milestone: May 28 (DO IT YOURSELF!)
First quiz: May 23
First team milestone: June 13
FAQs, links to external resources, etc.
Cases page where any code can be reused without honor code violation!
Strongly recommended: Who’s Who page

10. Project This Semester Drawing Editors
M1 (individual): Build a simple drawing editor
M2 (team): Make a more powerful drawing editor: More tools, move/erase/resize
M3: Design everything
M4: Generate and input Postscript
M5: Make it a web service

11. Philosophy of the Course
The course is on design, for novice designers
If you know UML, Corba, COM, and XP already, great. Most people here don’t.
But there’s a big focus on learning, not just lecturing at you.
So you have to implement your designs — live in them. Figure out where they’re bad
The course isn’t explicitly on programming in Squeak, but implicitly (to get you design feedback), it is. Quizzes will focus on Squeak programming

12. Why Squeak? Why not Java? Why not C++?
Marvin Minsky: “If you only know something in one way, you don’t know it at all.”
Faculty agreed that you should see something not C-based
Other reasons:
Great for UI
Different model for programming: Can’t use emacs
All the sources are there for everything

13. Why this class can be aggravating
It’s not about job skills, per se
No Delphi or Visual Basic here
Few job postings for Squeak these days (but increasing number for Smalltalk)
It’s about ways of thinking that are core to CS, about ways of designing programs
About where the core ideas of computers today came from
It’s about designing, critiquing designs, making tradeoffs, and making choices

14. Approach of Book (and elsewhere)
Concrete before Abstract
Build things before design them
Learning involves testing and failure
You have to try things in Squeak
Generation and Inquiry, over Transmission
There is no Squeak API
But there are lots of great tools for poking through the system
We'll teach the tools to help you learn how to figure it out for yourself