Practical way to experience Specification by Example | Scrum Gathering Shanghai 2012 | 2012-06-04 | Page 1 (28)

Practical Ways to sBE

Larry Cai

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who I am

› Larry: An open source, collaboration & Agile evangelist› Software Practice Pioneering:

Discover the best suitable methods and tools to improve the efficiency of software development– Git, CI, Sonar, Agile, Eclipse, Cloud, Code review

› mail: larry.caiyu@gmail.com

› weibo: http://weibo.com/larrycaiyu› blog: http://codeslife.com

Larry Cai

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Requirement is the important thing for software development

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One good way to improve your requirement handling

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agenda

› WHAT is specification by example› How we make changes› Key learning› suggestion

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agenda

› WHAT is specification by exampleWHAT is specification by exampleWHAT is specification by exampleWHAT is specification by example

› How we make changes› Key learning› suggestion

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Specification by example

› Based on capturing and illustrating requirements using realistic examples instead of abstract statements.

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User story

Requirement: customer can check order information before purchase

Feature: As a Returning Customer I want the system to remember my details so I can purchase goods more quickly.

Acceptance criteria:Scenario: Review Details Before Purchase

Given I’m on the Amazon websiteAnd I’m logged in as a returning customerWhen I click the “1-Click” buttonThen I should see my order details

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Specification by example

› Based on capturing and illustrating requirements using realistic examples instead of abstract statements.

› Collaborative approach to defining requirements and business-oriented functional tests for software products

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All others

Created by http://www.wordle.net/

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agenda

› WHAT is specification by example› How we make changesHow we make changesHow we make changesHow we make changes

– Embrace exampleEmbrace exampleEmbrace exampleEmbrace example

– Change delivery planChange delivery planChange delivery planChange delivery plan

› Key learning› suggestion

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without example

› Feature: Free deliveryCustomer will get free delivery when buy some books

Weight vs. Number

Shanghai vs. Taiwan

Books with USB

Books with wash machine

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problem

› Technical debts in the end of iteration (notice the gap between design and verification)

› Waterfall inside the iteration› Less focus on the requirement in the beginning and no

efficient way to clarify the requirement

Do we do the right thing from the beginning ?Do we do the right thing from the beginning ?Do we do the right thing from the beginning ?Do we do the right thing from the beginning ?

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Example matters

› Feature: Free Delivery› Example:

– Customer has 6 books in cart gets free delivery– Customer has 5 books in cart doesn’t get free delivery– Customer has 6 books in cart and delivery address to shanghai is

free delivery– Customer has 6 books in cart and delivery address to Qinghai

doesn’t get free delivery– Customer has 6 books in cart and one 2G USB get free delivery– Customer has 6 books in cart and one wash machine get ?

› Customer buy 6 books (included) and only books can have free delivery to mainland (exclude Tibet,….)

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Tool is good, but it is not must-have to use

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Specification by example

Source: key process from the book “Specification by example”

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Embrace Example

› Team works with Product Owner for more examples (less how, more what) for each feature– Short vague and abstract description to nature language in example– Do it until passenger can understand

› Not easy to change. Training, coach and push in beginning

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visible requirement

› One source and everyone check/challenge !

Wall, White board ….

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Start from example

› Discuss in small group and spread to the team to make it more efficiency

› Test case comes from example and continuously to challenge what !

› Implement according to the example and focusing on how !

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Change deliver plan

› From component based to feature based

Task based Feature based/Delivery

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clear drive

› Deliver plan based on the requirement– Tester is most suitable

› Done of definition is more easy to track and clear

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agenda

› WHAT is specification by example› How we make changes› Key learningKey learningKey learningKey learning

› suggestion

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Key learning

› Specification by example gives good improvement– Better way for requirement clarification, easier than you can

image–Motivation for testers

› Learn and deploy, and continuously improve it.– Bring testers into front to push for the quality of the requirement– Collaborate efficiency by visible them

› Tools (like cucumber) is very useful, but is not necessary in the beginning

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Compare to …

› Example is more nature for people to understand and directed connect to business (compare to test…)

› Collaboration is the key to refine the requirement and improve step by step (compare to driven …)

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agenda

› WHAT is specification by example› How we make changes› Key learning› suggestion

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suggestion

› Start from changing delivery plan to make team work together with business mindset

› Push team to clarify the requirement using example› Training, Coach in the beginning to touch real case instead

of demo

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weibo: http://weibo.com/larrycaiyu

实例化需求，你行的