Software Maintenance - Types and Cost Distribution

Definition of Software Maintenance

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What is software maintenance?

A process that only applies to hardware, never to software

The act of permanently deleting an old system without any replacement

The general process of changing a system after it has been delivered

The process of writing the very first version of a software system

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Three Types of Software Maintenance

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Type

Environmental adaptation

Fault repair

Functionality addition

Description

Adapting the software to new platforms and environments such as new hardware or operating systems

Fixing bugs and security vulnerabilities discovered in the system

Adding new features and supporting new requirements as the business changes

Match each type of software maintenance to its correct description.

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Relative Cost of Different Error Types in Fault Repair

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Sort the following error types by cost to repair, from cheapest to most expensive.

Design errors (may involve rewriting several program components)

Requirements errors (may require extensive system redesign)

Coding errors (usually relatively cheap to correct)

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No Clear-Cut Distinction Between Maintenance Types

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True or False: In practice, there is always a perfectly clear-cut distinction between fault repair, environmental adaptation, and functionality addition, with no overlap between the categories.

True

False

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Naming Confusion in Maintenance Terminology

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Why does the text avoid using the terms 'corrective,' 'adaptive,' and 'perfective' maintenance?

Because these terms only apply to hardware maintenance, never software

Because these terms were banned by international software engineering standards bodies

Because different people use these terms inconsistently; for example, 'perfective maintenance' is sometimes used for new requirements and sometimes for structural improvement

Because these terms are trademarked and cannot legally be used in textbooks

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Largest Share of Maintenance Effort

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Based on survey data comparing studies from 1980 to 2010, which type of maintenance activity consumes the largest share of overall maintenance effort?

Environmental adaptation

Functionality addition or modification

Fault repair

All three types consume exactly equal shares

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Stability of Maintenance Cost Distribution Over Time

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True or False: A comparison of maintenance cost distribution studies spanning roughly 30 years found that the proportions had changed very little over that period.

True

False

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Definition of Software Maintenance

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Explanation

Three Types of Software Maintenance

Type

Description

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Explanation

Relative Cost of Different Error Types in Fault Repair

Correct Answer

Explanation

No Clear-Cut Distinction Between Maintenance Types

Correct Answer

Explanation

Naming Confusion in Maintenance Terminology

Correct Answer

Explanation

Largest Share of Maintenance Effort

Correct Answer

Explanation

Stability of Maintenance Cost Distribution Over Time

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Explanation

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