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Questions and Answers
What is an attribute in a class?
What is an attribute in a class?
How are one-word attribute names typically written?
How are one-word attribute names typically written?
What is the convention for multi-word attribute names?
What is the convention for multi-word attribute names?
How is an object's name represented in relation to its class?
How is an object's name represented in relation to its class?
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What does a UML diagram enable you to specify for attributes?
What does a UML diagram enable you to specify for attributes?
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How many attributes can a class have according to the text?
How many attributes can a class have according to the text?
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What is represented by boxes at the top of a sequence diagram?
What is represented by boxes at the top of a sequence diagram?
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During what time period does an object exist in a sequence diagram?
During what time period does an object exist in a sequence diagram?
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What type of message requires the caller to wait for the receiving object to finish executing the operation?
What type of message requires the caller to wait for the receiving object to finish executing the operation?
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Which type of message does not require the sender to wait for the recipient to handle the message?
Which type of message does not require the sender to wait for the recipient to handle the message?
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What is a simple message in a sequence diagram?
What is a simple message in a sequence diagram?
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What aspect of a sequence diagram involves the time during which an object performs an operation?
What aspect of a sequence diagram involves the time during which an object performs an operation?
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What is a multivalued attribute?
What is a multivalued attribute?
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What is a repeating group in a database model?
What is a repeating group in a database model?
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What does double lines in an ER diagram indicate?
What does double lines in an ER diagram indicate?
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In what scenario can a weak entity exist?
In what scenario can a weak entity exist?
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What is the difference between representing dependents as multivalued attributes and as separate entities?
What is the difference between representing dependents as multivalued attributes and as separate entities?
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Why do weak entities require an identifying relationship with a strong entity?
Why do weak entities require an identifying relationship with a strong entity?
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What term describes the process by which a product or service initially takes root at the bottom of a market and then displaces established competitors?
What term describes the process by which a product or service initially takes root at the bottom of a market and then displaces established competitors?
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Which of the following is NOT a characteristic of disruptive technologies?
Which of the following is NOT a characteristic of disruptive technologies?
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What does Agile usage-centered design primarily focus on?
What does Agile usage-centered design primarily focus on?
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In the traditional Software Development Life Cycle (SDLC), how are users involved in the design and implementation phase compared to Agile methodologies?
In the traditional Software Development Life Cycle (SDLC), how are users involved in the design and implementation phase compared to Agile methodologies?
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What is the main focus of 'The Planning Game' based on eXtreme programming?
What is the main focus of 'The Planning Game' based on eXtreme programming?
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What is a key aspect of Requirements Determination using Agile Methodologies?
What is a key aspect of Requirements Determination using Agile Methodologies?
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What is the key activity of project planning?
What is the key activity of project planning?
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Why is project initiation planning (PIP) considered challenging?
Why is project initiation planning (PIP) considered challenging?
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Who is responsible for performing the project initiation process?
Who is responsible for performing the project initiation process?
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What is the focus of establishing a project initiation plan?
What is the focus of establishing a project initiation plan?
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Which phase focuses on organizing a team to conduct project planning?
Which phase focuses on organizing a team to conduct project planning?
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What must be considered when deciding on the division between project initiation and planning and analysis?
What must be considered when deciding on the division between project initiation and planning and analysis?
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Study Notes
Class and Attributes
- A class is defined with attributes, which are properties that describe the class
- Attributes have a name and a type (e.g., string, integer)
- Attributes can have default values
- Every object of the class has a specific value for every attribute
UML Notation
- Attribute names are written in lowercase letters, with multiple words joined and capitalized
- Attribute types can be specified in UML notation (e.g., string, integer, Boolean)
- Default values can be specified for attributes
Sequence Diagrams
- Sequence diagrams show objects and their interactions over time
- Objects are represented by boxes at the top of the diagram
- Lifelines represent the time period during which an object exists
- Messages are used for objects to communicate with each other
- Activation represents the time period during which an object performs an operation
Message Types
- Synchronous message: the caller waits for the receiving object to finish executing the operation
- Asynchronous message: the sender does not wait for the recipient to handle the message
- Simple message: transfers control from the sender to the recipient without describing the details of the communication
Attribute Types
- Multivalued attribute: can take on more than one value for each entity instance
- Repeating group: a set of two or more multivalued attributes that are logically related
Disruptive Innovation
- Disruptive innovation: a process where a product or service starts at the bottom of a market and moves up, eventually displacing established competitors
- Disruptive technologies: enable the breaking of long-held business rules that inhibit organizations from making radical business changes
Agile Methodologies
- Continual user involvement: users are involved throughout the development process
- Iterative analyze–design–code–test cycle: replaces traditional SDLC waterfall approach
- Agile usage-centered design: focuses on user goals, roles, and tasks
Project Initiation and Planning
- Project initiation: focuses on organizing a team to conduct project planning
- Project planning: defines clear, discrete activities and the work needed to complete each activity
- Key considerations for project initiation and planning include:
- Who is responsible for performing the PIP process?
- How much effort should be expended on the PIP process?
- What must be considered when making the decision on the division between project initiation and planning?
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Description
Explore the concepts of multivalued attributes and repeating groups in the context of database design. Learn about the notation for representing multivalued attributes with curly braces and identifying identifiers within a database schema.
