The document outlines several use cases for a textbook exchange application including registering a user account, posting a book for sale, searching for books to buy, and viewing/modifying/deleting posts. Each use case describes the main flow including user and system interactions and alternative flows to handle exceptions.

1. Group 1

2.  Introduction & Scope
 Use Cases
 Current Iteration Use Case
 Class Diagram
 Plan for Next Iteration
 Interesting Experiences
 Future Enhancements
 Demo

3.  Real-life problem
 Buy/Sell books
 Less expensive
 Saves time
 Reliable

4.  Scope: Textbook Exchange Application
 Level: user-goal
 Primary Actor: User posting book
 Stakeholders and Interests:
 -User posting book: User wants to quickly and easily post a
book for other users to search for
 -Users searching for books to buy: These users want accurate
listings to search through to find books
 Preconditions:
 -User has successfully opened and logged into the
application
 Success Guarantee (or post conditions) :
 -Book is posted (stored in database) successfully and
accurately

5.  User indicates he/she wants to post a book for
sale
 System prompts user to input book information
 User supplies the book information (including
picture) to the system and indicates when they
are finished
 System adds the book information to the
database to be stored in the users posted books
list and be searchable by other users
 System notifies the user the that book was
successfully added
 Systems notifies the user if the book they posted
is in another users want to buy list

6.  3a. User does not input information in all required fields (title,
author, edition, asking price) before submitting entry
◦ System prompts user to input information into required fields
◦ User inputs additional information and then submits
◦ These steps are repeated until all required information is input
 3b. User attempts to upload a picture that is too large
◦ The system notifies user the picture is too big, and indicates the
maximum file size
◦ User uploads a smaller picture, or submits post without a picture for
successful post
 3c. User inputs too many characters into a field
◦ Systems alerts user that they input too many characters into field and
indicates maximum number of characters
◦ User modifies information and submits again
◦ These steps repeat until input is valid
 4a. System is not able to add the book to the database
◦ System determines if phone has internet connection
 Phone is not connected to the internet
 System indicates book cannot be posted because there is no internet connection
 Phone is connected to the internet
 System indicates that the book cannot be added and to please try again at a later
time

7.  Name: Create User Account
 Scope: Textbook Exchange Application
 Level: user-goal
 Primary Actor: User creating account
 Stakeholders and Interests:
 -User creating account: User wants to quickly and
easily create an account
 - Preconditions:
 -User has successfully installed and opened the
application
 Success Guarantee (or post conditions) :
 -Account is created successfully so that user can
login to application

8.  User opens the application and indicates
he/she wants to create a new user account
 The system prompts the user to enter a user
name, password, email address, school
he/she attends, and optional phone number
 User enters the required information and
indicates when they are finished
 System notifies the user that the account was
successfully created

9.  3a. User does not input information in all required fields (username, password, email
address, school) before submitting entry
◦ System prompts user to input information into required fields
◦ User inputs additional information and then submits
◦ These steps are repeated until all required information is input
 3b. User inputs too many characters into a field
◦ System alerts user that they input too many characters into field and indicates maximum number of characters
◦ User modifies information and submits again
◦ These steps repeat until input is valid
 4a. System is not able to create the user account
◦ System determines if phone has internet connection
 Phone is not connected to the internet
 System indicates book cannot be posted because there is no internet connection
 Phone is connected to the internet
 User name selected by user already exists
 System notifies user the selected user name is already being used and to please select a new
user name
 Communication between application and cloud service is not available
 System notifies user the account cannot be made and to please try again later

10.  Name: Search for and indicate desire to buy book
 Scope: Textbook Exchange Application
 Level: user-goal
 Primary Actor: User searching for book
 Stakeholders and Interests:
 -User searching for book: User wants to quickly search for
books to buy with accurate results. User wants to be able to
easily contact the seller
 -User selling the book: User wants his/her post displayed in
search results with accurate contact information provided to
the buyer
 - Preconditions:
 -User has successfully logged into the application
 Success Guarantee (or post conditions) :
 -User receives accurate search results, and is able to contact
the seller of any books he/she is interested in

11.  User indicates he/she wants to search for a book.
 The system prompts the user to enter search information
(title, author, edition, ISBN, course, professor)
 The user inputs his/her search information (can be one to
all fields) and indicates he/she are finished
 The system displays a list of search results to the user.
 The user selects a post from the list.
 The system displays detailed results about the post and
gives the user the option to contact the seller by email,
and phone and text if the seller provided a phone number.
 User indicates his/her desired method of contact
 System contacts the seller using the selected contact
method.

12.  4a. There are no posts matching the information provided
by the user
◦ The system indicates that there are no posts matching the
information provided by the user and allows the user to perform
another search or cancel the search
 The user indicates he/she wants to search again
 System returns to 2 in main success scenario
 The user indicates he/she does not want to search again
 System exits the search
 4b. User does not want to buy any of the listed books
◦ System prompts user to search again or cancel search
 The user indicates he/she wants to search again
 System returns to 2 in main success scenario
 The user indicates he/she does not want to search again
 System exits the search
 6a. User decides he/she does not want to buy the book
◦ User indicates he/she does not want to buy the book
◦ System returns to the search results (4 in main success scenario)

13.  Name: View/Modify/Delete Posts
 Scope: Textbook Exchange Application
 Level: user-goal
 Primary Actor: User viewing/modifying/deleting posts
 Stakeholders and Interests:
 -User viewing/modifying/deleting post – Want to view
posts and easily select a post to modify or delete
 -User searching for books: Wants posts to be modified
accurately and removed from search results when deleted
 - Preconditions:
 -User has successfully logged into the application and
posted a book
 Success Guarantee (or post conditions) :
 -User is able to successfully view all posts and select posts
to modify and delete. If the user modifies a post it should
be updated correctly by the system, and if the user deletes
a post it should be removed by the system.

14.  The user indicates he/she wants to view a list of
his/her posts
 The system displays a list of the books the user has
posted
 The user selects which post he/she wants to
modify/delete from the list
 The systems displays all information related to the
post previously provided by the user
 The user either modifies the information and
indicates when finished, or indicates that he/she
wants to delete the post
 The system either saves the modified post or deletes
the post depending on what the user selected and
notifies the user that the modification/deletion was
successful.
 The system returns the user to his/her list of posts

15.  5a. The user removes required fields of title,
author, edition, or price and then indicates he/she
is finished
◦ The system prompts the user to input the required
information
◦ The user inputs the required information and indicates
when finished
◦ These steps are repeated until all information is supplied
 6a. The system cannot modify or delete the post
◦ The system cannot connect to the server
 The system notifies the user it cannot connect to the server
and to please try again later
◦ The system cannot modify or delete the post for another
reason
 The system notifies the user that post was not
modified/deleted successfully.

16.  Scope: Textbook Exchange Application
 Level: user-goal
 Primary Actor: User trying to register
 Stakeholders:
◦ User registering to post a book
 Success Guarantee: User is registered
successfully and is able to login.

17.  User indicates he/she wants to register on
application.
 System prompts user to input required information.
 User supplies information and indicates when
finished.
 System stores the information.
 System notifies user registration was successful.
 User logs into application

18.  3a. User does not provide all required
information
◦ System prompts user to input required information
◦ User inputs additional information and submits
 6a. User Forgot Password
◦ 1. User indicates he/she forgot password
◦ 2. System prompts user to input email address
◦ 3. User inputs required information and submits
• 4. System sends email to user
• 5. User follows instructions for resetting password
• 6. System updates password

19.  Scope: Textbook Exchange Application
 Level: user-goal
 Primary Actor: User posting book
 Stakeholders:
◦ User posting book
 Success Guarantee: Book is posted
successfully and accurately

20.  User indicates he/she wants to post book
 System prompts user to input book information
 User supplies information and indicates when
finished
 User captures the image and indicates when finished.
 System stores the book information and image
 System notifies seller posting was successful

21.  6a. User does not provide all required
information
◦ System prompts user to input required information
◦ User inputs additional information and submits

22.  Scope: Textbook Exchange Application
 Level: user-goal
 Primary Actor: User searching for and buying
book
 Stakeholders:
◦ User searching for and buying book
◦ User selling book
 Success Guarantee: User is able to search for
desired book, and contact the seller of any
books he/she is interested in

23.  User indicates he/she wants to search for a book
 System prompts user to enter search information
(title, author, edition, ISBN, course, professor)
 User supplies information and indicates when
finished
 System displays list of matching books
 User selects a book from the list to see detailed
information and photo if available
 Systems displays detailed information and allows user
to email, call, or text seller
 User selects preferred contact method
 System contacts seller using selected method

24.  2a. User does not provide any search criteria
◦ System prompts user to input required information
◦ User inputs information and indicates when finished