Reuse‑Oriented Software Engineering

Core idea of reuse-oriented software engineering

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Reuse-oriented software engineering focuses on building systems by composing existing software components rather than developing everything from scratch.

Which statement best describes the core idea of reuse-oriented software engineering?

Reuse is limited to copying and pasting code fragments between projects.

All software must be written from scratch in a single programming language.

Only user interfaces are reused; all business logic is always new.

System development focuses on integrating existing components and COTS systems into a new system.

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Process stages in reuse-oriented development

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Reuse-oriented software engineering has characteristic stages that differ from purely bespoke development.

Which set of stages best matches the reuse-oriented process model?

Planning; coding; debugging; deployment

Feasibility study; requirements elicitation; validation; retirement

Requirements analysis; detailed design; coding; maintenance only

Component analysis; requirements modification; system design with reuse; development and integration

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Diagram: reuse-oriented process flow

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The diagram below shows a simplified reuse-oriented software engineering process.

What does this diagram emphasize about reuse-oriented development?

Integration is optional if enough components exist.

Design is completed before any component analysis occurs.

Requirements may be modified to match available components before detailed design and integration.

Components are always built from scratch before analysis.

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Types of reusable components

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Reuse-oriented software engineering relies on different kinds of reusable assets.

Which of the following are explicitly mentioned as types of reusable components?

Web services; collections of objects; stand-alone configurable systems

Spreadsheets and paper forms only

Only open-source libraries written in C

Hardware devices; network cables; keyboards

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COTS systems in reuse-oriented development

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Commercial off-the-shelf (COTS) systems are an important source of reusable functionality.

Which statement best describes the role of COTS systems in reuse-oriented software engineering?

They must always be rewritten before integration.

They are only used as documentation examples and never executed.

They are used only for testing, not for production systems.

They provide complete subsystems that can be configured and integrated into a larger system.

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Advantages of reuse-oriented development

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Reuse-oriented software engineering offers several potential advantages.

Which of the following are advantages of reuse-oriented development?

Reduced development cost; reduced risk; faster delivery

Guaranteed perfect requirements; no need for testing; zero maintenance

Elimination of all documentation; no need for design

Ability to ignore user needs completely

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Disadvantages of reuse-oriented development

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Reuse-oriented development also has drawbacks.

Which of the following is a key disadvantage?

It ensures full control over the evolution of all components.

Requirements compromises may be necessary to fit available components.

It eliminates the need to understand the problem domain.

It always guarantees a perfect match to user needs.

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Loss of control over evolution

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When using third-party components, organizations may lose some control over system evolution.

Why does reuse-oriented development reduce control over system evolution?

All components are always open source and can be changed freely.

The organization owns and maintains every component internally.

New versions of reusable components are controlled by external suppliers.

Components never change once integrated.

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Component analysis stage

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Component analysis is a key stage in reuse-oriented development.

What is the main goal of the component analysis stage?

To design hardware devices for the system.

To remove all existing components from the system.

To search for existing components that can implement some or all of the required functionality.

To write all components from scratch in a new language.

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Requirements modification stage

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After candidate components are identified, requirements may need to be adjusted.

What happens during the requirements modification stage?

Requirements are revised to reflect the capabilities and limitations of available components.

Requirements are frozen and cannot be changed.

All requirements are discarded and replaced with component documentation.

Only non-functional requirements are considered.

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Classification: component type

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Statement

×Developed according to service standards and invoked remotely over a network

×A collection of objects designed to be integrated with a framework such as .NET or J2EE

×A complete software system configured for use in a particular environment

Web Service

Object Package

Stand-alone System

This question classifies statements about reusable assets into component types. Parent categories are: Web Service, Object Package, and Stand-alone System.

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Match: reuse-oriented stage to description

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To complete the line match

Click on an item in the first group
Click on an item in the second group
To delete a match, double click on a line

Stage

Component analysis

Requirements modification

System design with reuse

Development and integration

Description

Search for components that may implement required functionality

Revise requirements to reflect available components

Design system framework around reusable components

Develop missing software and integrate components

Match each reuse-oriented process stage to its primary description.

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Multiple Answers: when reuse is most beneficial

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Reuse is not equally beneficial in all contexts.

Select all situations where reuse-oriented development is particularly attractive.

When the system requirements are extremely unique and no components exist

When there is a rich ecosystem of components or COTS products in the domain

When time-to-market is critical and existing components can provide core functionality

When regulatory constraints require the use of certified reusable components

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Diagram: architecture with reusable components

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The diagram shows a system architecture that integrates multiple reusable components.

What does this architecture illustrate about reuse-oriented systems?

All functionality must be implemented in a single monolithic component.

The application layer coordinates and integrates multiple heterogeneous reusable components.

Reusable components cannot coexist in the same system.

Only web services can be reused; other components must be rewritten.

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Classification: advantage vs disadvantage of reuse

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Statement

×Reduced amount of new software to be developed

×Faster delivery of the system

×Requirements compromises may be necessary

×Loss of control over component evolution

Advantage

Disadvantage

Classify each statement as an Advantage or Disadvantage of reuse-oriented software engineering. Parent categories: Advantage, Disadvantage.

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Multiple Answers: informal vs systematic reuse

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The text distinguishes between informal reuse and more systematic reuse-oriented processes.

Select all statements that describe informal reuse.

Components are discovered through ad hoc searching or personal memory

Reuse happens without a defined organizational process or repository

Developers copy designs or code they know from previous projects

Reuse is governed by a formal component catalog and selection process

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Sort: typical order of reuse-oriented stages

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Please drag and drop the options to sort them

Sort the following reuse-oriented stages into their typical order from first to last.

Requirements specification

Component analysis

Requirements modification

System design with reuse

Development and integration

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Reuse and system reliability

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One motivation for reuse-oriented software engineering is to improve system reliability by relying on components that have already been exercised in other contexts.

Which statement best explains why reuse can improve reliability?

Reusable components may have been used and tested in many different systems before.

Reusable components remove the need for any system-level testing.

Reusable components are always mathematically proven to be correct.

Reusable components never contain defects when first delivered.

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Multiple Answers: constraints when reusing COTS components

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Using COTS components in reuse-oriented development introduces specific constraints on the system and its evolution.

Select all statements that correctly describe such constraints.

The system architecture may need to conform to the COTS component’s integration mechanisms.

The organization must accept the functionality and interfaces provided by the COTS component.

Upgrades to the COTS component may force changes in the overall system.

The organization can freely modify the internal source code of the COTS component.

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Classification: reuse level in the process

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Statement

×Adopting an existing COTS product as the core of a new application

×Integrating a third-party payment module into an e-commerce site

×Reusing a library class that implements a generic list data structure

System-level reuse

Component-level reuse

Object-level reuse

Classify each statement according to the level of reuse it primarily refers to. Parent categories: System-level reuse, Component-level reuse, Object-level reuse.

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Core idea of reuse-oriented software engineering

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Process stages in reuse-oriented development

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Diagram: reuse-oriented process flow

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Types of reusable components

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COTS systems in reuse-oriented development

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Advantages of reuse-oriented development

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Disadvantages of reuse-oriented development

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Loss of control over evolution

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Component analysis stage

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Requirements modification stage

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Classification: component type

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Match: reuse-oriented stage to description

Stage

Description

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Multiple Answers: when reuse is most beneficial

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Diagram: architecture with reusable components

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Classification: advantage vs disadvantage of reuse

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Multiple Answers: informal vs systematic reuse

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Sort: typical order of reuse-oriented stages

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Reuse and system reliability

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Multiple Answers: constraints when reusing COTS components

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Classification: reuse level in the process

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