REQUIREMENTS ANALYSIS

Initialize Use Case for Encounter Encounter foreign character player designer Set rules actors Encounter Travel to adjacent area Initialize 1. System displays player’s main character in the dressing room. 2. System displays a window for setting his character's qualities Initialize Use case Use case details Adapted from Software Engineering: An Object-Oriented Perspective by Eric J. Braude (Wiley 2001), with permission.

Initialize Use Case for Encounter Encounter foreign character player designer Set rules actors Encounter Travel to adjacent area Initialize 1. System displays player’s main character in the dressing room. 2. System displays a window for setting his character's qualities. 3. Player allocates the qualities of his main character. 4. Player chooses an exit from the dressing room. 5. System moves player’s main character into the area on the other side of the exit. Initialize Use case Use case details Adapted from Software Engineering: An Object-Oriented Perspective by Eric J. Braude (Wiley 2001), with permission.

Engage Foreign Character Use Case player designer Initialize Use case Encounter Travel to adjacent area Set rules Engage Foreign Character 1. System displays the foreign character in the same area as the player’s. 2. System exchanges quality values between the two characters. 3. System displays the results of the engagement. 4. System displays player’s character in a random area. Engage foreign character Use case details Adapted from Software Engineering: An Object-Oriented Perspective by Eric J. Braude (Wiley 2001), with permission.

Conceptual Model of the System Player EncounterGame Area MainCharacter ForeignCharacter 1 1 n n Plays Has Engagement 1 n Has Takes place in 1 1 Entity Relationship Model or Object Model

Data Flow Diagram: Explanation of Symbols Account # & deposit Get deposit Check deposit Processing element Data type Direction of data flow

Data Flow Diagram: Explanation of Symbols Account # & deposit balance query User account database account data Get deposit Create account summary Check deposit Printer Input Output Processing element Data type Direction of data flow Data store …... Adapted from Software Engineering: An Object-Oriented Perspective by Eric J. Braude (Wiley 2001), with permission.

Partial Data Flow Diagram for ATM Application account # & deposit balance query account # & deposit account # User Make inquiry account database deposit transaction account data Get deposit Get inquiry Validate inquiry Do deposit transaction Create account summary Validate deposit error Printer member banks bank name Display account account # account data account display Adapted from Software Engineering: An Object-Oriented Perspective by Eric J. Braude (Wiley 2001), with permission.

Partial Encounter State-Transition Diagram Setting up Preparing Waiting Complete setup Foreign character enters area Engaging Player clicks qualities menu Adapted from Software Engineering: An Object-Oriented Perspective by Eric J. Braude (Wiley 2001), with permission.

Using Conditions in State-Transition Diagrams Engaging Waiting [foreign character absent] [foreign character present] Player moves to adjacent area event condition state Adapted from Software Engineering: An Object-Oriented Perspective by Eric J. Braude (Wiley 2001), with permission.

Setting qualities Sketch of Encounter State-Transition Diagram Setting up Engaging Waiting Player completes setup Player dismisses report window Reporting Foreign character enters area Encounter completed Player dismisses set qualities widow Player requests status Player requests to set qualities Foreign character enters area [foreign character absent] [foreign character present] Player moves to adjacent area Player quits Adapted from Software Engineering: An Object-Oriented Perspective by Eric J. Braude (Wiley 2001), with permission.

Conceptualizing a System in terms of the User Interface Customers/Users often conceive a system in terms of its user interface Screen prototyping and story boarding (screen facade but no code) works well in connection with Use Case

Step 1: Know your user (C) ‡ Step 2: Understand the business function in question (C) Step 3: Apply principles of good screen design (C, D) Step 4: Select the appropriate kind of windows (C, D) Step 5: Develop system menus (C, D) Step 6: Select the appropriate device-based controls (C) Step 7: Choose the appropriate screen-based controls (C) Step 8: Organize and lay out windows (C, D) Step 9: Choose appropriate colors (D) Step 10: Create meaningful icons (C, D) Step 11: Provide effective message, feedback, & guidance (D) Steps for Constructing User Interfaces* * adapted from Galitz [Ga2] ‡ a C-requirement process

Applying Principles of Good Screen Design: “Before” * see Galitz [Ga2] TypecheckingsavingmmfCD BranchMain St. Elm St.High St. Privilegesnewsletter discountsquick loans First name Middle name Last name Street City State/county OKApply CancelHelp Adapted from Software Engineering: An Object-Oriented Perspective by Eric J. Braude (Wiley 2001), with permission.

Applying Principles of Good Screen Design: “After” checking OKApplyCancelHelp Account typePrivileges saving mmf CD newsletter discounts quick loans Branch Main St. Elm St. High St. New Customers Name First Middle Last Address Street City State/county Adapted from Software Engineering: An Object-Oriented Perspective by Eric J. Braude (Wiley 2001), with permission.

How Principles of Good Screen Design Were Applied checking OKApplyCancelHelp Account typePrivileges saving mmf CD newsletter discounts quick loans Branch Main St. Elm St. High St. New Customers Name First Middle Last Address Street City State/county Ensure consistency Anticipate start Align like elements Group like elements Border around like elements SymmetryBalance Proportion Use Captions Adapted from Software Engineering: An Object-Oriented Perspective by Eric J. Braude (Wiley 2001), with permission.

Window Usage 1of 2 2. Purpose: obtain additional information so as to carry out a particular task or command -- dialog window Properties of automobile 189 PropertyValue BrandToyota ModelCamry ID Help Word ___________________ This screen All screens 1. Purpose: display properties of an entity -- property window Adapted from Software Engineering: An Object-Oriented Perspective by Eric J. Braude (Wiley 2001), with permission.

3. Purpose: provide information -- message window 4. Purpose: present a set of controls -- palette window 5. Purpose: amplify information -- pop-up window Window Usage 2of 2 ABC alert message Caution: “age” must be < 120 OK This is a popup window, designed to provide on-the-fly amplification ABC controls File Edit View Format Tools Help monitordiskkeyboardmodem Adapted from Software Engineering: An Object-Oriented Perspective by Eric J. Braude (Wiley 2001), with permission.

Provide a main menu Display all relevant alternatives (only) Match the menu structure to the structure of the application’s task Minimize the number of menu levels –Four maximum? Develop System Menus

Common GUI Terms checking Apply Account typePrivileges saving mmf newsletter discounts New Customer Name First Last Cancel Cascading windows Tiled windows Text box Radio button Check box Button back forward Screen Icon Adapted from Software Engineering: An Object-Oriented Perspective by Eric J. Braude (Wiley 2001), with permission.Graphics reproduced with permission from Corel.

Preliminary Sketch of User Interface for Setting Game Character Qualities 16 Adapted from Software Engineering: An Object-Oriented Perspective by Eric J. Braude (Wiley 2001), with permission.

Preliminary Encounter Screen Shot Name of adjacent area Name of adjacent area Name of adjacent area Name of adjacent area Adapted from Software Engineering: An Object-Oriented Perspective by Eric J. Braude (Wiley 20001), with permission.Graphics reproduced with permission from Corel.

Express Customer Requirements 1/2 If the requirement is simple, and stands alone, express it in clear sentences within an appropriate section of the SRS If the requirement is an interaction between the user and the application, express via a use case. 1. Name the use case 2. Identify the “actor” the external user role-- usually a person 3. Write the sequence of user - application actions Minimize branching Use general form. Avoid specific names and values as in “Ed enters $300”. Instead, say “customer enters deposit amount”. Adapted from Software Engineering: An Object-Oriented Perspective by Eric J. Braude (Wiley 2001), with permission.

If the requirement involves process elements, each taking inputs, and producing outputs, use data flow. 1. Identify the processing elements (usually high level); show as circles or rectangles 2. Identify the data sources & destinations; show as names between two horizontal lines 3. Show the data paths among processing elements. Indicate types of data flowing on each If the requirement involves states that the application can be in (or parts can be in) 1. Identify the states (each a passive verb, e.g., “waiting”); show as rounded rectangles 2. Show initial state with special arrow 3. Identify the events (happenings external to the unit) that cause transitions among the states; show as labeled arrows 4. Identify sub-states; show as rectangles within rectangles Express Customer Requirements 2/2