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Build or Buy Decision

publish date: 2026/06/13 06:39:41.956731 UTC

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One of the most important implementation decisions at an early stage is whether to build or buy the application software. Which of the following correctly describes the 'buy' approach?

Using only open-source components without any configuration or adaptation

Buying off-the-shelf application systems that can be adapted and tailored to users' requirements - usually cheaper and faster than developing a new system, shifting the design process to focus on configuring the product

Outsourcing all development to an offshore team

Writing all code from scratch using a high-level programming language

Correct Answer

Explanation

For many types of application it is now possible to buy off-the-shelf application systems that can be adapted and tailored to users' requirements. This is usually cheaper and faster than developing a new system. When developing by reusing an off-the-shelf product, the design process focuses on how to configure the application system to meet requirements rather than on designing object models.

Reference

Software Engineering, Ian Sommerville, 10th edition

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