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Uploaded byKevlin Henney
Turning Development Outside-In
The document discusses software development practices, emphasizing the importance of understanding problems rather than rushing to conclusions and solutions. It introduces Scrum as a method to balance developer needs with management and customer demands through sprints for iterative development. It also highlights the necessity of well-defined unit tests to ensure code correctness and the significance of clear communication with customers regarding their true needs.
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Turning Development Outside-In
- 1.
- 2. What We TalkAbout When We Talk About Development @KevlinHenney
- 3. What We TalkAbout When We Talk About Requirements @KevlinHenney
- 5. Too often wepush the problem into the background because we are in a hurry to proceed to a solution.
- 6. If you readmost software development texts thoughtfully, you will see that almost everything is about the solution; almost nothing is about the problem.
- 7.
- 8.
- 9.
- 10. It's expensive to knoweverything up front. Kolton Andrus
- 11. You have tofinish things — that's what you learn from, you learn by finishing things. Neil Gaiman
- 12. SCRUM: A Pattern Languagefor Hyperproductive Software Development Teams Mike Beedle, Martine Devos, Yonat Sharon,Ken Schwaber, and Jeff Sutherland
- 13. SCRUM Master Sprint Backlog SCRUM Meetings DemoAfter Sprint SCRUM Master Sprint Backlog SCRUM Meetings Demo After Sprint
- 14. Problem You want tobalance the needs of developers to work undisturbed and the needs of management and the customer to see real progress, as well as control the direction of that progress throughout the project. Solution Divide the project in Sprints. A Sprint is a period of approximately 30 days in which an agreed amount of work will be performed to create a deliverable. Each Sprint takes a pre-allocated amount of work from the Backlog. Sprint
- 15.
- 16.
- 17. Develop Develop DevelopDevelop
- 18.
- 20. If a plotworks out exactly as you first planned, you're not working loosely enough to give room to your imagination and instincts.
- 21.
- 22. pantser, noun ▪ Writerwho writes by the seat of their pants. ▪ In contrast to a plotter, a pantser doesn't work to (or have) an outline.
- 24. Your Customers Do NotMean What They Say Nate Jackson
- 25. I’ve never meta customer yet that wasn’t all too happy to tell me what they wanted—usually in great detail. The problem is that customers don’t always tell you the whole truth. Nate Jackson
- 26. They generally don'tlie. They use their terms and their contexts. They leave out significant details. They make assumptions. Nate Jackson
- 27. This is compoundedby the fact that many customers don’t actually know what they want in the first place! Nate Jackson
- 28. Systems have properties —capabilities, features, characteristics, etc. — inside and out.
- 29. Development should discover thespecific properties desired and make them so.
- 31.
- 32.
- 33.
- 34.
- 35. ▪ ▪ ▪ ▪ ▪ ▪ Try to leave outthe part that readers tend to skip. Elmore Leonard
- 36.
- 37.
- 39. Stack {new, push, pop,depth, top}
- 40. Given When Then an empty stack anitem is pushed it should not be empty
- 41. Given When Then an empty stack anitem is pushed if it's OK with you, I think that, perhaps, it should probably not be empty, don't you think?
- 42. Omit needless words. WilliamStrunk and E B White The Elements of Style
- 43. Make definite assertions. Avoidtame, colourless, hesitating, noncommittal language. When a sentence is made stronger, it usually becomes shorter. Thus brevity is a by-product of vigour. William Strunk and E B White The Elements of Style
- 44. Given When Then an empty stack anitem is pushed it is not empty
- 45. Given When Then And an empty stack anitem is pushed it has a depth of 1 the top item is the item that was pushed
- 46.
- 47. Non-EmptyEmpty depth depth top push pop [depth> 1] push pop [depth = 1] new
- 48. public class Stack_spec { publicstatic class A_new_stack { @Test public void is_empty() } public static class An_empty_stack { @Test() public void throws_when_queried_for_its_top_item() @Test() public void throws_when_popped() @Test public void acquires_depth_by_retaining_a_pushed_item_as_its_top() } public static class A_non_empty_stack { @Test public void becomes_deeper_by_retaining_a_pushed_item_as_its_top() @Test public void on_popping_reveals_tops_in_reverse_order_of_pushing() } }
- 49. public class Stack_spec { public staticclass A_new_stack { @Test public void is_empty() } public static class An_empty_stack { @Test() public void throws_when_queried_for_its_top_item() @Test() public void throws_when_popped() @Test public void acquires_depth_by_retaining_a_pushed_item_as_its_top() } public static class A_non_empty_stack { @Test public void becomes_deeper_by_retaining_a_pushed_item_as_its_top() @Test public void on_popping_reveals_tops_in_reverse_order_of_pushing() } }
- 50. public class Stack_spec { public staticclass A_new_stack { @Test public void is_empty() } public static class An_empty_stack { @Test() public void throws_when_queried_for_its_top_item() @Test() public void throws_when_popped() @Test public void acquires_depth_by_retaining_a_pushed_item_as_its_top() } public static class A_non_empty_stack { @Test public void becomes_deeper_by_retaining_a_pushed_item_as_its_top() @Test public void on_popping_reveals_tops_in_reverse_order_of_pushing() } }
- 51. Systems have properties —capabilities, features, characteristics, etc. — inside and out.
- 53.
- 54. We want ourcode to be unit testable. What is a unit test?
- 55. A test isnot a unit test if: ▪ It talks to the database ▪ It communicates across the network ▪ It touches the file system ▪ It can't run at the same time as any of your other unit tests ▪ You have to do special things to your environment (such as editing config files) to run it. Michael Feathers http://www.artima.com/weblogs/viewpost.jsp?thread=126923
- 56. A unit testis a test of behaviour whose success or failure is wholly determined by the correctness of the test and the correctness of the unit under test. Kevlin Henney http://www.theregister.co.uk/2007/07/28/what_are_your_units/
- 57. What do wewant from unit tests?
- 58. When a unittest passes, it shows the code is correct.
- 59. When a unittest fails, it shows the code is incorrect.
- 60. As a I want Sothat $Role $Feature $Benefit
- 61. As a I want Sothat developer of the software $Feature $Benefit
- 62. As a I want Sothat developer of the software clean code $Benefit
- 63. As a I want Sothat customer of the software $Feature $Benefit
- 64. As a I want Sothat user of the software $Feature $Benefit
- 65. As a I want Sothat $Role logging $Benefit
- 66. As a I want Sothat developer of the software logging $Benefit
- 67. As a I want Sothat customer of the software logging $Benefit
- 68. As a I want Sothat $Role documentation $Benefit
- 69. As a I want Sothat $Role an agile process $Benefit
- 70. As a I want Sothat As shown by $Role $Feature $Benefit $Evidence
- 72. Design an architectural spaceto accommodate a specific program, experience, or intent.