The document discusses limiting work in progress (WIP) or "Red" by measuring and visualizing it. Red refers to tasks that are not completed and in a work in progress state. It provides several patterns for fighting Red like parallel change, narrowed change, sequence change and graceful retreat. It emphasizes measuring Red to learn from test metrics and adapt practices accordingly to keep Red limited and work in smaller batch sizes.

1. Acceptance Criteria

2. Joseph Wilk

3. Limited Red
Oh crap
Joseph Wilk

4. Work In Progress

5. Work In Progress

6. Context Switching is
Expensive

7. Small Batch sizes

8. Red == Work in Progress

9. Why is Red Bad?

10. Limit Red
Measure Red
Visualise Red
Learn

11. Are we
Professionals?

15. Joseph Wilk
PAIRING
RED TIME
TESTING
REFACTORING

16. Measuring &
Visualising Red

17. Limited Red
Learn and adapt from test metrics

19. Industrial Logic

20. Industrial Logic

23. Fighting
Red

24. Patterns
‣Parallel Change
‣Narrowed Change
‣Sequence Change
‣Graceful Retreat
‣Piecemeal Change
‣Gradual Change
‣Evolved Target
‣Unified Methods Joshua
Kerievsky

25. Parallel Change
def resize_image(image, size)
...
end
Method
def resize_as_thumb_for_image(image)
...
end

26. Parallel Change
class Image class ThumbImage
Class end end

27. Parallel Change
Calendar Calendar
Service service service
v1 v2

28. Narrowed Change
<%- if @game.player?(@active_user) &&
@black_player.present? &&
@white_player.present? %>
<%= render :template => 'messaging' %>
<%- end %>
<%- if @game.player?(@active_user) &&
@black_player.present? &&
@white_player.present? %>
<%= render :template => 'messaging' %>
<%- end %>

29. Narrowed Change
<%- game_presenter.show_messaging? do %>
<%= render :template => 'messaging' %>
<%- end %>
class GamePresenter
def initialize(game, black_payer, white_player)
@game, @black_player, @white_player = game,
black_player, white_player
end
def show_messaging?(&block)
messaging_should_be_visible = @game.player?(@user) &&
@black_player.present? && @white_player.present?
yield block if messaging_should_be_visible
end
end

30. Sequence Change
Remove Narrowed Extract
control flag change method

31. Sequence Change
Narrowed Remove Extract
change control flag method

32. Graceful Retreat
Please step away from the Yak... Slowly
Shave?

33. http://www.refactoring.com/catalog/index.html

34. Learning more from Red
‣ Smart Continuous integration
‣ Failure rate
‣ Performance
‣ Flickering

38. Evil hat

40. More Books!

41. “To measure is to know”
Lord Kelvin

42. Merci
@josephwilk
joe@josephwilk.net

43. Merci
@josephwilk
joe@josephwilk.net
Green