7.4 Student B


Cost


• Development costs of software can be lower because of code reuse. • Old versions of software can be supported indefinitely so there is no forced upgrade to new versions to ensure support.


• Open source software typically requires lower specification hardware.


• Higher levels of technical expertise may be required to maintain open source systems.


• A wide range of free applications can be obtained for open source operating systems, although they may not be as sophisticated as proprietary software.


5.4 Student C


3 Quantitative


= statistical info, often by carrying out experiments or through questionnaires


+ good for factual info; overview of trends ... large nos.


– if looking at human-computer interaction sample must be big; results may ≠ reliable; low response rate for questionnaires


7.4 Student C


Flexibility • Openly available source code means it is much easier to transfer or ‘port’ the code to new platforms, i.e., convert it so it can be used on a different operating system.


• Existing code can be ‘forked’ to develop different versions, e.g., both a stable release with basic features and a multi-featured, less stable, release for others.


• New features can be added by users without having to consult with software owners.


• Open source operating systems are more modular and provide more control over which features are installed.


105


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