SE C4 Software Design Principles and Practices

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Questions and Answers

What is the primary characteristic of the waterfall model in the software development life cycle?

  • It integrates testing before implementation begins.
  • It captures logical relationships between software activities. (correct)
  • It allows for frequent changes in requirements during development.
  • It emphasizes parallel activities in software development.

Which phase in the waterfall model follows the specification phase?

  • Testing
  • Design (correct)
  • Maintenance
  • Implementation

In the context of the software product life cycle, what is indicated by the maintenance phase?

  • Completion of product testing and sign-off.
  • Only minor updates to existing products.
  • Product redesign and engineering redesign. (correct)
  • The phase where new products are developed.

What is the main focus of engineering design within the software life cycle?

<p>To align the product design with software specifications. (A)</p> Signup and view all the answers

How does the waterfall model characterize the relationship between development activities?

<p>By clearly defining sequential phases. (B)</p> Signup and view all the answers

What is the primary role of software designers?

<p>To specify the nature and composition of software products (C)</p> Signup and view all the answers

How does thinking of design as problem solving provide advantages?

<p>It highlights that there may be multiple good solutions (D)</p> Signup and view all the answers

Which of the following is NOT a focus of design principles in software development?

<p>Maximizing the cost of development (A)</p> Signup and view all the answers

What defines abstraction in software design?

<p>Suppressing irrelevant properties to focus on essential aspects (A)</p> Signup and view all the answers

What is a significant benefit of employing abstraction in problem solving?

<p>It promotes focus on the most important aspects of a problem (B)</p> Signup and view all the answers

Which statement about design principles is accurate?

<p>They help to make software maintainable and efficient (C)</p> Signup and view all the answers

What is one method suggested in problem-solving during design?

<p>Trial and error (A)</p> Signup and view all the answers

What characteristic is NOT a goal of abstraction in software design?

<p>Enhancing the complexity of objects (D)</p> Signup and view all the answers

What is a key distinction between requirements and design activities?

<p>Design activities formulate problems to be solved. (A)</p> Signup and view all the answers

What is the primary purpose of modeling in design?

<p>To abstract details of the target (D)</p> Signup and view all the answers

Why is the traditional way to distinguish between requirements and design considered inadequate?

<p>Because many design choices fit into specific requirements. (B)</p> Signup and view all the answers

What is typically the first step to address design problems?

<p>Formulating requirements (A)</p> Signup and view all the answers

Which modeling approach begins by solving an abstract version of a problem?

<p>Top-down strategy (B)</p> Signup and view all the answers

Which of the following best describes a static design model?

<p>It represents unchanging aspects during execution (B)</p> Signup and view all the answers

Which of the following is NOT a solution generated by the design process?

<p>Client feedback (C)</p> Signup and view all the answers

What role do constraints play in the software design process?

<p>They limit the problem-solving capabilities. (D)</p> Signup and view all the answers

What can lead to a failure of a model?

<p>Omitting important and relevant details (B)</p> Signup and view all the answers

Which of the following is an example of a dynamic model?

<p>State diagram (B)</p> Signup and view all the answers

What does 'SRS' stand for in the context of design solutions?

<p>Software Requirement Specification (B)</p> Signup and view all the answers

What is the last step depicted in the design process?

<p>Write code (D)</p> Signup and view all the answers

In modeling, which purpose focuses on understanding a problem?

<p>Problem understanding (C)</p> Signup and view all the answers

How do design interactions contribute to the overall design process?

<p>They help in identifying software design problems. (D)</p> Signup and view all the answers

Which strategy involves solving parts of a problem and connecting them for a complete solution?

<p>Bottom-up strategy (D)</p> Signup and view all the answers

How do models function effectively in design?

<p>By abstracting irrelevant details (D)</p> Signup and view all the answers

What is a primary function of a software design method/tool?

<p>To meet clients' needs and constraints (C)</p> Signup and view all the answers

Which of the following is a component of design methods?

<p>Design Principles (D)</p> Signup and view all the answers

What do design heuristics provide in software design?

<p>Guidance for achieving design goals (C)</p> Signup and view all the answers

What do the SOLID principles in software design aim to improve?

<p>Flexibility and maintainability of object-oriented code (A)</p> Signup and view all the answers

Which of the following is an example of a design pattern?

<p>Singleton (C)</p> Signup and view all the answers

What is the focus of abstraction in software design?

<p>Simplifying complex systems by highlighting essential details (A)</p> Signup and view all the answers

Which of the following is NOT considered a design practice?

<p>Design Metrics (D)</p> Signup and view all the answers

What does the term 'Design Notations' refer to in software design?

<p>A symbolic representational system (B)</p> Signup and view all the answers

What is the primary purpose of decomposition in software design?

<p>To break a system into smaller, manageable parts (D)</p> Signup and view all the answers

Which design practice is focused on protecting the integrity of data within an object?

<p>Encapsulation (B)</p> Signup and view all the answers

What is one of the main benefits of following established design practices?

<p>Ensuring software is built with a clear structure (A)</p> Signup and view all the answers

Which concept is described as a fundamental design technique?

<p>Abstraction (D)</p> Signup and view all the answers

What is the role of documentation and modeling in software design?

<p>To assist in planning and communicating design decisions (C)</p> Signup and view all the answers

What effect do design principles have on code quality?

<p>They lead to cleaner, more reliable code (B)</p> Signup and view all the answers

Which design method was introduced first in the timeline provided?

<p>Stepwise refinement (C)</p> Signup and view all the answers

How can software design be characterized?

<p>As problem solving (B)</p> Signup and view all the answers

Flashcards

Software Design

The act of specifying the design of a software product to meet client needs, considering limitations.

Design as Problem Solving

Viewing design as a problem-solving process, which often involves multiple solutions.

Design Principles

Fundamental guidelines used to create well-structured, maintainable, and efficient software systems.

Abstraction

A technique that simplifies problems by focusing on essential aspects and ignoring unimportant details.

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Importance of Abstraction

The ability of abstraction to make problems simpler by highlighting crucial elements and ignoring unnecessary details.

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Abstraction: Filtering Unnecessary Information

The process of filtering out unimportant characteristics to concentrate on the relevant ones in a problem.

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Waterfall Model

This model describes the stages involved in developing software. Starting with requirements, then moving to design, implementation, testing, and finally maintenance.

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Software Product Life Cycle

This refers to the entire process of creating and maintaining a software product, encompassing stages from initial conception to retirement.

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Requirements Specification

This stage involves defining user needs, functionalities, and constraints for the software.

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Design

During this stage, the software’s structure, components, and interactions are defined.

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Implementation

This stage involves writing the actual code that implements the design and functionalities.

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Decomposition

The process of breaking down a complex system into smaller, more manageable parts. This helps to understand the system's components and their interactions.

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Top-Down Strategy

A strategy for solving problems by starting with a general, abstract outline and then adding details in a step-by-step process.

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Bottom-Up Strategy

A strategy for solving problems by starting with smaller, individual parts and connecting them to form a complete solution.

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Model

A representation of a target system that uses model parts to correspond to target parts and model relationships to represent target relationships.

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Modeling in Design

The use of models to understand, design, evaluate, and document a system.

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Static Design Model

A type of design model that represents aspects of a system that don't change during execution.

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Dynamic Design Model

A type of design model that represents what happens during a system's execution.

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Model Limitations

Models can fail to accurately represent a system if important or relevant details are ignored.

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Software Design Method

A systematic approach to creating a software design that fulfills client requirements and constraints.

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Design Process

A collection of tasks that convert inputs into outputs, like planning, analysis, and implementation.

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Design Notations

Symbolic representations used to convey designs, such as diagrams, flowcharts, or code.

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Design Heuristics

Rules that guide design decisions, but don't guarantee success.

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Design Practices

Established methods used in software design, ensuring systems are efficient, maintainable, and scalable.

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SOLID Principles

Guidelines for writing object-oriented code that promotes flexibility and maintainability.

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Design Patterns

Pre-defined solutions to common design problems, like the Singleton, Factory, and Observer patterns.

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What vs. How in Software Development

A way to categorize activities: Requirements focus on WHAT the system needs to do, while Design focuses on HOW the system should do it.

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Problem with 'What' vs. 'How'

This distinction is not always clear, as what initially seems like a requirement might become a design decision, and vice versa.

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Requirements vs. Design: Problem Solving

Requirements identify a problem that needs to be addressed, while Design provides a solution to that problem.

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Software Design Problem

It encompasses all the needs, desires, and constraints from the user or client regarding the desired software.

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Software Design Solution: Features and Capabilities

Features and capabilities of the software that directly address the identified problem.

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Software Design Solution: Interactions

Interactions between different components or parts of the software to achieve the desired functionality.

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Software Design Solution: SRS (Software Requirements Specification)

A document that formally captures all the requirements of the software project.

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High-Level Design Document

A higher-level blueprint that outlines the overall structure, components, and how they interact.

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Encapsulation

Protecting data by hiding implementation details and only exposing essential features through controlled methods.

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Documentation and Modeling

Creating visual representations like flowcharts and diagrams to plan and communicate design decisions.

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Why Design Practices Matter

Ensuring software is structured clearly, making it testable, maintainable, and adaptable to changes.

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Design Method Timeline

Software development techniques evolved from structured designs to object-oriented approaches, marked by milestones like UML releases, impacting how we build software.

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Software Design Process

The process of building a software product, encompassing stages from initial conceptualization to retirement.

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Study Notes

Software Design Principles and Practices

  • Software design is crucial for creating efficient, maintainable, and scalable software systems.
  • Software design is viewed as a problem-solving activity
  • Design principles are fundamental guidelines, aiming to make software easy to understand, flexible, and resilient to changes.
  • Key aspects of design include abstraction, modeling, and decomposition.
  • Abstraction simplifies problems by focusing on essential details, ignoring non-critical aspects.
  • Modeling involves creating representations of target systems, enabling clear visualizations and relationships.
  • Decomposition breaks down complex systems into smaller, more manageable parts.
  • Types of design models include static models (representing unchanging program aspects during execution) and dynamic models (representing actions during execution).
  • Examples of static models are class and object models.
  • Examples of dynamic models are state diagrams and sequence diagrams.
  • Software products are entities comprising programs, data, supporting materials, and services catering to client needs.
  • Design methods use design principles, design heuristics (rules guiding achievement of certain outcomes), processes (tasks leading to outputs), and notations (symbolic representations).
  • Software design encompasses both product design (emphasizing features, capabilities, and interfaces to meet client requirements) and engineering design (concentrating on programs, sub-systems, and constituent components to comply with product specifications).
  • Product design primarily focuses on the requirements specification phase, while engineering design is centered around the design and implementation phases.
  • Established design practices, techniques, and guidelines result in high-quality software, and improved software maintainability.
  • Design principles aid in developing well-structured, reliable, and easy-to-work-with code.

Design Method Components

  • Design Process: Collection of tasks transforming inputs into outputs.
  • Design Notations: Symbolic representation system.
  • Design Heuristics: Rules providing guidance for achieving outcomes.
  • Design Methods also use design principles stating characteristics of designs that make them better or worse.

Design Practices

  • Encompasses established approaches, techniques, and guidelines used to create maintainable, scalable, efficient software systems.
  • Key elements include SOLID principles (guidelines for writing object-oriented code), design patterns (well-known solutions solving design problems, e.g., Singleton, Factory, Observer), architectural patterns (high-level patterns structuring entire applications, e.g., MVC, Microservices), and processes and techniques (e.g., abstraction, decomposition, encapsulation, documentation, and modeling).

Why Design Practices Matter

  • Crucial for creating well-structured, easy-to-test, and maintainable software adapting well to changes.
  • Result in the development of higher-quality software with fewer errors.

Design Method Timeline

  • Key milestones in software design methods include:
    • 1971: Stepwise refinement (Niklaus Wirth)
    • 1974: Structured design (Stevens, Myers, Constantine)
    • Late 1970s-Early 1980s: Structured analysis and design methods
    • Late 1980s: Object-oriented methods
    • 1995: UML 0.8 release
    • 2004: UML 2.0 release

Summary

  • Software Design is important and thought of as problem solving.
  • Abstraction and Modeling are fundamental.
  • Design is both product and engineering.
  • Product design mostly during requirements; engineering design during design and implementation.
  • Object-oriented analysis and design methods are now commonplace.

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