Building in quality - Speaker Deck

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Building in quality Jakub Zalas 7th of April 2014

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@jakzal @jakub_zalas @SensioLabsUK £

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QUALITY? What is

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Quality is really two levers: external and internal quality. External quality is the quality perceived by the customer. [Internal quality is] Quality of internals of the system: how well it is designed, how good the internal tests are, and so on.

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How would you deﬁne software quality? @jakub_zalas

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the extent to what the software takes into account what matters most for the customer & the maintainability of the source code @_md External quality Internal quality

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software quality? That the software delivers real value and is built in a sustainable way. @IanDominey External quality Internal quality

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MORE IMPORTANT? What is

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Ignoring the external quality

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Ignoring the internal quality

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INTERNAL QUALITY

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SHOULD WE CARE?

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Ignoring the internal quality Care No care Time # of features

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Ignoring the internal quality Time Pace Care No care Care No care

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IS OUR PROFESSIONAL RESPONSIBILITY Ensuring the internal quality

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CONTINUOUSLY REVIEW THE DESIGN To MAINTAIN the internal quality

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REFACTOR To MAINTAIN the internal quality

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TESTS There’s no refactoring without

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IS OUR PROFESSIONAL RESPONSIBILITY Writing tests

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DESIGN WELL To BUILD the internal quality

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DRIVE YOUR CODE WITH TESTS To BUILD the internal quality

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WE LEARN HOW TO KEEP THE DESIGN SIMPLE Writing tests FIRST

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IS OUR PROFESSIONAL RESPONSIBILITY Writing tests FIRST

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IS ALL ABOUT TDD Building the quality into our app

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EXTERNAL QUALITY

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BDUF

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Requirements Design Implementation Veriﬁcation Maintenance

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GET IT RIGHT FROM THE START

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WHEN IS IT YOU KNOW THE LEAST ABOUT YOUR PROJECT?

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WE LEARN DURING THE IMPLEMENTATION

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AGILE TO THE RESCUE!

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SCRUM

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WATERFALL

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WATERSCRUMFALL

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"I need users to log into the site to track their delivery." Mr Client

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As a User I need to log into the site So I could track my delivery

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As a User I need to see my deliveries So I could know when it's going to be delivered

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CLIENT CAME WITH A SOLUTION

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WHAT'S THE GOAL?

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5 WHYS

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"I need users to log into the site to track their delivery." "Why?" "So they could see where's their package." "Why?" "What do you mean? They need to track their deliveries." "Yes, but why?"

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"Well, our mission is to offer the most customer friendly courier services. We want to increase the number of satisfied customers." "Aha!" "So they wouldn't get impatient and file complaints when the delivery is delayed." "Why?" "So they could know when is it going to be delivered." "Why?"

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THE GOAL!

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< 5% of customers filing complaints Customers Support Notifications Contact the Customer if delivery is delayed Add expected delivery time to the confirmation message SMS notifications Add a tracking URL to the confirmation message E-mail notifications List of deliveries after logging in Prevent complaints Check delivery status Why? Who? How? What?

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MAKE IMPACTS NOT SOFTWARE Gojko Adžić impactmapping.org

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EXAMPLE WORKSHOP

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Feature: Tracking deliveries As a Customer I need to see a status of my delivery So I could know when it's going to be delivered Scenario: Clicking a tracking URL Given I am waiting for a delivery And I received a conﬁrmation message When I click the tracking URL from the message Then I should see a status of my delivery Scenario: Clicking a tracking URL month after delivery Given I my package was delivered a month ago And I kept the conﬁrmation message When I click the tracking URL from the message Then I should be informed the tracking URL has expired

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LET'S CODE

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Failing step Failing test Code Refactor Passing step External Internal

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THANK YOU!

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Credits •  http://www.rgbstock.com/photo/mfXiaE4/Angry+Sumo •  http://www.nightmarefactory.com/cgi-bin/shopper?preadd=action&key=RU909885