3.05_The ''extend'' Dependency
rmb1905・2 minutes read
The extended dependency relationship between use cases allows an optional connection where an extending use case, like printing a receipt, enhances a base use case such as purchasing gas with a credit card without being essential to its completion. Identifying an extension point is crucial for integrating the extending use case effectively, while it is recommended to use such extensions sparingly to maintain clarity in diagrams, as they are secondary to the primary functionality of the base use case.
Insights
- The extended dependency relationship between use cases allows for optional enhancements to a base use case, where an extending use case, like "print receipt," adds extra steps without being essential to the main process, such as "purchase gas with credit card." This relationship is visually represented in diagrams with the extending use case positioned below the base use case, indicating its secondary nature.
- Identifying an extension point is crucial when integrating an extending use case, as it shows where the additional steps fit within the base use case's sequence, such as after charging the account for gas. While these extensions can enhance functionality, they should be used judiciously to prevent diagram clutter, maintaining the focus on the primary actions of the base use case.
Get key ideas from YouTube videos. It’s free
Recent questions
What is a use case in software development?
A use case in software development is a detailed description of how a user interacts with a system to achieve a specific goal. It outlines the steps taken by the user and the system's responses, providing a clear understanding of the functional requirements. Use cases help in identifying the interactions between users and the system, ensuring that all necessary functionalities are captured. They serve as a foundation for system design, testing, and validation, making them essential for successful software development.
How do I improve my time management skills?
Improving time management skills involves several strategies that can help individuals prioritize tasks and use their time more effectively. One effective approach is to create a daily or weekly planner that outlines tasks and deadlines, allowing for better organization. Setting specific goals and breaking larger tasks into smaller, manageable steps can also enhance productivity. Additionally, minimizing distractions, such as turning off notifications or creating a dedicated workspace, can help maintain focus. Regularly reviewing and adjusting one’s schedule based on what works best can lead to continuous improvement in time management.
What are the benefits of meditation?
Meditation offers numerous benefits for both mental and physical well-being. It can reduce stress and anxiety by promoting relaxation and helping individuals manage their thoughts more effectively. Regular practice of meditation has been shown to improve concentration and attention span, leading to enhanced productivity. Furthermore, meditation can foster emotional health by increasing self-awareness and promoting a positive outlook on life. Physically, it may lower blood pressure and improve sleep quality, contributing to overall health. As a holistic practice, meditation encourages a balanced lifestyle and can be easily integrated into daily routines.
How can I boost my creativity?
Boosting creativity can be achieved through various techniques and lifestyle changes that encourage innovative thinking. Engaging in diverse experiences, such as traveling, trying new hobbies, or meeting new people, can provide fresh perspectives and inspire creative ideas. Setting aside dedicated time for brainstorming without judgment allows for free-flowing thoughts and exploration of possibilities. Additionally, practicing mindfulness and relaxation techniques can help clear mental blocks, making space for creativity to flourish. Collaborating with others and seeking feedback can also stimulate new ideas and enhance creative processes.
What is the importance of effective communication?
Effective communication is crucial in both personal and professional contexts as it fosters understanding and collaboration. It enables individuals to express their thoughts, ideas, and feelings clearly, reducing the likelihood of misunderstandings and conflicts. In the workplace, effective communication enhances teamwork, boosts morale, and increases productivity by ensuring that everyone is on the same page. It also plays a vital role in building relationships, as open and honest dialogue promotes trust and respect. Overall, effective communication is essential for achieving goals, resolving issues, and creating a positive environment.
Related videos
Summary
00:00
Understanding Extended Use Case Relationships
- The extended dependency relationship between use cases indicates an optional connection where the extending use case enhances the base use case by adding additional steps. In this relationship, the base use case, such as "purchase gas with credit card," contains a series of steps, and at a certain point, an option arises to include the extending use case, like "print receipt," which is not necessary for the completion of the base use case. The dependency arrow points from the extending use case to the base use case, and it is conventional to position the extending use case below the base use case in diagrams.
- When incorporating an extending use case, it is important to identify an extension point, which indicates where the extending use case fits into the base use case's steps, such as after the account is charged for the gas purchase. The extending use case can occur either synchronously or asynchronously with the base use case. While using extension use cases can provide additional functionality, they should be used sparingly to avoid cluttering diagrams, and they are typically considered secondary to the main functionality of the base use case, which in this example is charging the gas purchase to a credit card.
