Implementation Issues

This quiz covers the three key implementation issues in software engineering: software reuse (levels and costs), configuration management (four activities), and host-target development (development platforms, IDEs, and deployment decisions)

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Views #: 215

Questions #: 12

Time: 10 minutes

Pass Score: 80.0%

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Three Key Implementation Issues

1 pts

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Software engineering includes activities beyond programming. Three implementation issues are particularly important and often not covered in programming textbooks. Which three are they?

Configuration management - managing the different versions of each software component

Host-target development - developing on one computer and executing on another

Algorithm selection - choosing the most efficient algorithm for each operation

Reuse - making as much use as possible of existing components or systems

User interface design - designing screens and interaction flows

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Four Levels of Software Reuse

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Level

Component level

Abstraction level

Object level

System level

Description

You don't reuse software directly but use knowledge of successful abstractions in design; design patterns and architectural patterns are examples

You directly reuse objects from a library rather than writing the code yourself; requires finding appropriate libraries and checking if objects and methods offer the required functionality

Components are collections of objects that operate together to provide related functions and services; you adapt and extend by adding your own code - e.g., using a UI framework

You reuse entire application systems; usually involves some configuration of these systems, which may involve integrating several application systems

Software reuse is possible at several different levels of abstraction. The diagram below shows these levels. Match each level to its correct description.

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Benefits of Software Reuse

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Which of the following are genuine benefits of reusing existing software? Select ALL that apply.

Reused software should be more reliable than newly written software

New systems can be developed more quickly

Fewer development risks because reused software has been tested in other applications

Lower overall development cost compared to developing from scratch

Development costs are always zero when reuse is involved

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Costs of Software Reuse

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Reuse is not free - there are costs associated with it. Which of the following are recognised costs of software reuse? Select ALL that apply.

The cost of integrating reusable elements with each other and with new code, which can be difficult when providers make conflicting assumptions

The time spent searching for software to reuse and assessing whether it meets your needs

The cost of re-testing the entire system from scratch regardless of how much was reused

The cost of adapting and configuring reusable components or systems to reflect the requirements of your system

The cost of buying the reusable software (which can be very high for large off-the-shelf systems)

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Configuration Management - Definition and Purpose

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Which of the following best describes configuration management and why it is essential in software development?

The process of testing software configurations to ensure they meet security requirements

The process of writing configuration files for deploying software to production servers

The general process of managing a changing software system to support system integration so all developers can access project code in a controlled way, find out what changes have been made, and compile and link components to create a system

The process of configuring the user preferences in a deployed software product

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Four Configuration Management Activities

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Activity

Problem tracking

System integration

Release management

Version management

Description

Support is provided to keep track of the different versions of software components and to coordinate development by several programmers - stops one developer overwriting code submitted by another

Support is provided to help developers define what versions of components are used to create each version of a system; this description is used to build the system automatically by compiling and linking required components

Support is provided to allow users to report bugs and other problems, and to allow all developers to see who is working on these problems and when they are fixed

New versions of a software system are prepared and released to customers; concerned with planning the functionality of new releases and organising software for distribution

There are four fundamental configuration management activities. Match each activity to its description.

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Host-Target Development Model

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Most professional software development is based on a host-target development model. Which of the following correctly describes this model?

Host-target development only applies to mobile application development

Software is developed on one computer (the host) using an IDE and compilers, then downloaded and executed on a separate computer (the target) which has the execution platform, libraries, and related systems

Software is developed and executed on the same single computer throughout the entire project

The host is the customer's computer and the target is the development team's server

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Simulators in Embedded Systems Development

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Why are simulators commonly used when developing embedded systems software using the host-target model?

Because simulators allow each developer to have their own execution platform without needing to download to physical target hardware, speeding up development - though simulators are expensive to develop and usually only available for the most popular hardware architectures

Because simulators eliminate all bugs that would be present on real hardware

Because simulators are faster than physical hardware for running the final production software

Because all embedded systems regulations require simulation testing before hardware testing

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Software Development Platform Tools

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A software development platform should provide a range of tools to support software engineering processes. Which of the following are tools typically included in a software development platform? Select ALL that apply.

Tools to support refactoring and program visualization

Configuration management tools to manage source code versions and to integrate and build systems

Testing tools such as JUnit that can automatically run a set of tests on a new version

An integrated compiler and syntax-directed editing system

Graphical editing tools such as tools to edit UML models

A customer billing and invoicing system

A language debugging system

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Integrated Development Environments (IDEs)

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Which of the following correctly describes what an Integrated Development Environment (IDE) is and how it works?

A single programming language with built-in debugging capabilities

A set of software tools that supports different aspects of software development within a common framework and user interface, providing data management and integration mechanisms so tools can work together

A hardware device that accelerates software compilation

A testing framework that automatically generates unit tests from source code

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Deployment Decision Factors

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Factor

Hardware and software requirements of a component

Component communications

Availability requirements of the system

Description

If a component is designed for a specific hardware architecture or relies on other software, it must be deployed on a platform that provides the required hardware and software support

High-availability systems may require components to be deployed on more than one platform so that if one platform fails, an alternative implementation of the component is available

If there is a lot of inter-component communication, deploying those components on the same platform or physically close platforms reduces communications latency

When deciding where to deploy software components in a distributed system, three factors must be considered. Match each factor to its description.

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Configuration Management Tools

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Drag the correct tool name into each placeholder.

Version management in teams is commonly supported by systems such as (1) or (2), which can support multi-site, multi-team development. Bug and issue tracking is typically handled by tools such as (3). A comprehensive set of CM tools is available around the (4) system.

Please drag and drop the selected option in the right place or type it instead

Subversion

Git

GitHub

Bugzilla

Eclipse

JUnit

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Undergraduate Professional

Three Key Implementation Issues

Correct Answer

Explanation

Four Levels of Software Reuse

Level

Description

Correct Answer

Explanation

Benefits of Software Reuse

Correct Answer

Explanation

Costs of Software Reuse

Correct Answer

Explanation

Configuration Management - Definition and Purpose

Correct Answer

Explanation

Four Configuration Management Activities

Activity

Description

Correct Answer

Explanation

Host-Target Development Model

Correct Answer

Explanation

Simulators in Embedded Systems Development

Correct Answer

Explanation

Software Development Platform Tools

Correct Answer

Explanation

Integrated Development Environments (IDEs)

Correct Answer

Explanation

Deployment Decision Factors

Factor

Description

Correct Answer

Explanation

Configuration Management Tools

Correct Answer

Explanation

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