17spm_L15
Case Study
SPM 2017 © Ron Poet Lecture 15 1
Introduction
Case Study
� South Coast Nautical Supplies sells everything associated with sailing.
� They currently have a website that asks the user to ring a number to
request a catalogue.
� They want to start selling things on their site.
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� They will start selling books, which are fairly cheap.
o If the site doesn’t lose sales compared with the phone and
catalogue, they plan to expand to other items.
� The site needs to be live in 30 days time.
Who are the Users
� Real users are people who buy sailing books, but we don’t have access
to them.
� The head of sales and marketing will be a proxy user.
� She wants a typical ecommerce site.
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o Search for books.
o Maintain a list of books each customer is interested in.
o Rate books they have bought.
o Check on the status of an order.
User Roles
� Initial brainstorming creates the following user roles:
� Hardcore sailor, novice sailor, new sailor, gift-buyer, non-sailing
spouse, administrator, head of sales, charter captain, experienced
sailor, sailing school, library, instructor.
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Consolidating Roles
� Novice and new sailors combined.
� Instructor and sailing school combined.
� Hardcore sailor and experienced sailor are both separate roles.
� Gift buyer and non-sailing spouse become non-sailing gift buyer.
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� Keep administrator.
� Head of sales becomes report viewer.
� Library becomes librarian.
Role Details
� Now work out details for each role under the headings:
o Experience with computers.
o Experience buying online.
o Experience with sailing terms.
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o
� The two roles expected to generate most sales are experienced sailor
and instructor.
� Create 2 personas.
o Teresa: an experienced sailor.
o Captain Ron: an instructor.
Create Stories
� Work through each role in turn for a couple of hours.
� Stories for Teresa.
o Search for books by author, title ISBN.
o View detailed information on a book.
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o
o Put books in shopping cart and buy them later.
o Remove books from the cart before buying.
o Enter billing and shipping address, as well as credit card numbers
to buy.
o Rate and review books.
Stories (2)
� Teresa (more stories).
o Set up an account that remembers addresses.
o Edit account information.
o Put books in a wish list that is visible to others.
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o
o Can transfer an item from their own or someone else’s wish list
into her shopping cart.
o A repeat customer must be able to find one book and complete an
order in less than 90 seconds.This is a constraint.
Captain Ron
� Stories for the instructor.Expected to buy the same books regularly
for students.
o View history of past orders.
o Easily repurchase items.
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o See the last three items they looked at, even between sessions.
More Stories by Role
� Novice sailor.
o See what books we recommend by topic.
� Non-sailing gift buyer.
o Easily see others wish lists.
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o
o Have items gift wrapped.
o Enclose a gift card with their own message.
� Report Viewer.
o See daily purchases by category.
o Must be authenticated before viewing reports.
o Website orders must end up in the same database as telephone
orders.Constraint.
More Stories by Role
� Adminstrator.
o Add new books.
o Approve reviews.
o Delete a book.
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o
o Edit info about a book.
� Customer.
o Check status of recent order and change it if it hasn’t been sent.
o Peak usage of 50 concurrent users. Constraint.
Estimates
� Developers think about each story in a group and come up with
estimates.
� Constraints take 0 story points.
� The 27 stories have costs ranging from ½, 1, 2, 4 and 8 story points.
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� Total story points are: 42, average = 1.6.
The Release Plan
� The website will be needed in 4 weeks.
� 2 iterations, each of 2 weeks.
� Two programmers estimate they will be able to complete 8 story points
in each iteration (velocity).
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� The customer prioritises the stories as must-have, should-have etc.
Must Have Stories, with cost
� 1-Search for author or title.
� 1-Put books in shopping cart.
� ½-Remove books from cart before buying.
� 2-Buy books in cart.
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� 2-Set up an account.
� 1-Administrator can add books.
� ½-Administrator can delete a book.
� 1-Administrator can edit information about a book.
Should Have Stories
� 1-Advanced search.
� ½-Edit credit card information in account.
� 1-Edit addresses in account.
� 4-See what books we recommend on a variety of topics.
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Iteration Plan
� Iteration 1.
o All but the last of the must-haves.
� Iteration 2.
o The rest of the must-haves and should haves.
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o
� They add up to 15 ½ story points and we have 16 available.
� We will not be able to do any more stories.
Acceptance Tests
� Search on title or author.
o Use searches that match at least one book.
o Use searches that do not match any books.
o Search on ISBN.
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o
� Put book in shopping cart.
o Put in-stock book in cart.
o Put the same book in twice.Count should go up.
o Put out of stock book in cart.User told the book will ship when
available.
Testing Constraints
� Telephone and web orders in same database.
o Place an order and verify that it ends in the correct database.
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