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![–Don Norman, The Design of Everyday Things
“The problem with the designs of most [software]
engineers is that they are too logical. We have to
accept human behavior the way it is, not the way we
would wish it to be.”](https://image.slidesharecdn.com/design-thinking-for-developers-180608221131/75/Design-Thinking-for-Developers-14-2048.jpg)
![https://en.wikipedia.org/wiki/Heuristic
“[A] heuristic is any approach to problem solving,
learning, or discovery that employs a practical
method not guaranteed to be optimal or perfect, but
sufficient for reaching an immediate goal.”](https://image.slidesharecdn.com/design-thinking-for-developers-180608221131/75/Design-Thinking-for-Developers-33-2048.jpg)
![–Don Norman, The Design of Everyday Things
“The problem with the designs of most [software]
engineers is that they are too logical. We have to
accept human behavior the way it is, not the way we
would wish it to be.”](https://crownmelresort.com/image.slidesharecdn.com/design-thinking-for-developers-180608221131/75/Design-Thinking-for-Developers-14-2048.jpg)
![https://en.wikipedia.org/wiki/Heuristic
“[A] heuristic is any approach to problem solving,
learning, or discovery that employs a practical
method not guaranteed to be optimal or perfect, but
sufficient for reaching an immediate goal.”](https://crownmelresort.com/image.slidesharecdn.com/design-thinking-for-developers-180608221131/75/Design-Thinking-for-Developers-33-2048.jpg)
Design Thinking for Developers
- 1.
- 2. Pop quiz: What iscomputer programming? A. Art B. Science C. Craft D. Design E. Engineering
- 3. –Donald Knuth http://www.paulgraham.com/knuth.html “Computer programmingis an art, because it applies accumulated knowledge to the world, because it requires skill and ingenuity, and especially because it produces objects of beauty. A programmer who subconsciously views himself as an artist will enjoy what he does and will do it better.”
- 4. –Donald Knuth http://www.paulgraham.com/knuth.html “When Ispeak about computer programming as an art, I am thinking primarily of it as an art form, in an aesthetic sense. The chief goal of my work as educator and author is to help people learn how to write beautiful programs… My feeling is that when we prepare a program, it can be like composing poetry or music”
- 6. Pop quiz: What iscomputer programming? A. Art B. Science C. Craft D. Design E. Engineering F. All of the above!
- 7. Pop quiz: What iscomputer programming? A. Art B. Science C. Craft D. Design E. Engineering F. All of the above! Today’s focus
- 8. Definitions • A softwarearchitect is a software expert who makes high-level design choices — Wikipedia • architect (noun) a person who designs and guides a plan or undertaking — Merriam-Webster’s Dictionary • architect (verb) design and make — Google Dictionary
- 9.
- 10. Don’t make methink 1. Don’t make me think 2. Make each page self-evident (requires no explanation), or at least self- explanatory. 3. Omit needless words 4. Facts of life: • We don’t read pages. We scan them. • We don’t make optimal choices. We satisfice. • We don’t figure out how things work. We muddle through.
- 13. –Don Norman, TheDesign of Everyday Things “The idea that a person is at fault when something goes wrong is deeply entrenched in society. That’s why we blame others and even ourselves… But in my experience, human error usually is a result of poor design: it should be called system error. Humans err continually; it is an intrinsic part of our nature. System design should take this into account. Pinning the blame on the person may be a comfortable way to proceed, but why was the system ever designed so that a single act by a single person could cause calamity? Worse, blaming the person without fixing the root, underlying cause does not fix the problem: the same error is likely to be repeated by someone else.”
- 14. –Don Norman, TheDesign of Everyday Things “The problem with the designs of most [software] engineers is that they are too logical. We have to accept human behavior the way it is, not the way we would wish it to be.”
- 15. –Don Norman, TheDesign of Everyday Things “Eliminate the term human error.”
- 16. –Don Norman, TheDesign of Everyday Things “Designers must please their clients, who are not always the end users…engineers, developers, manufacturing, services, sales, and marketing people…these groups are users, too, not of the product itself, but of the output of the design team.”
- 17. Tools that prevent developererrors • source control • continuous integration • managed memory • compiler • others…
- 19. The Ideal Software DevelopmentProcess 1. Procrastinate
- 22. –Aaron Sorkin Screenwriter behind“Steve Jobs”, “The West Wing”, “A Few Good Men”, and more “You call it procrastination, I call it thinking.”
- 24. –John Lasseter “You mustgo out and do research.” –Ed Catmull “Craft is what we are expected to know; art is the unexpected use of our craft…copying what’s come before is a guaranteed path to mediocrity”
- 25. –Ed Catmull “In KoreanZen, the belief that it is good to branch out beyond what we already know is expressed in a phrase that means, literally, “not know mind.” To have a “not know mind” is a goal of creative people. It means you are open to the new, just as children are.”
- 26. NIST: Relative costto repair defects at different stages in software development https://pdfs.semanticscholar.org/ 9b68/5f84da00514397d9af7f27cc0b7db7df05c3.pdf
- 27. The Ideal Software DevelopmentProcess 1. Procrastinate 2. Don’t solve the problem you were assigned
- 28.
- 29. –Don Norman, TheDesign of Everyday Things “A brilliant solution to the wrong problem can be worse than no solution at all: solve the correct problem.”
- 31. The Ideal Software DevelopmentProcess 1. Procrastinate 2. Don’t solve the problem you were assigned 3. Avoid writing code
- 32. –Rich Skrenta quoted on:https://blog.codinghorror.com/the-best-code-is-no-code-at-all/ “Code is bad. It rots. It requires periodic maintenance. It has bugs that need to be found. New features mean old code has to be adapted. The more code you have, the more places there are for bugs to hide. The longer checkouts or compiles take. The longer it takes a new employee to make sense of your system. If you have to refactor there's more stuff to move around.”
- 33. https://en.wikipedia.org/wiki/Heuristic “[A] heuristic isany approach to problem solving, learning, or discovery that employs a practical method not guaranteed to be optimal or perfect, but sufficient for reaching an immediate goal.”
- 34.
- 35. Heuristics for writingcode • Brevity of code • Featurefulness • Speed of execution • Time spent coding • Robustness • Malleability • Memory space • Disk space
- 36. Heuristics for writingcode • Brevity of code • Featurefulness • Speed of execution • Time spent coding • Robustness • Malleability • Memory space • Disk space 1st
- 37. DRY is aprerequisite for SOLID
- 38. SOLID Single responsibility principle:A class should have only one reason to change. Open/closed principle: classes should be open for extension, but closed for modification.
- 39. Inputs 1. XML file 2.JSON file 3. Text file 4. hard-coded string 5. user input (textbox) 6. web service Outputs 1. XML file 2. JSON file 3. Text file 4. hard-coded string 5. user input (textbox) 6. web service 7. console • Inheritance: multiplication 6 x 7 = 42 classes • Composition: addition 6 + 7 = 13 classes
- 40. –Jon Skeet https://codeblog.jonskeet.uk/2013/03/15/the-open-closed-principle-in-review/ “I’ve never"got" the open-closed principle.”
- 42. –Robert C. Martin(Uncle Bob) “Always leave the code you’re editing a little better than you found it.” Boy Scout Rule
- 43.