| modified software | is a subtopic of 1.1 - The Nature of Software |  |
| is a kind of software | |
| may have to be completely redesigned after many changes to it have caused it to deteriorate significantly | |
| software | can be easily duplicated | |
| can have usability without utility^2 | |
| can have utility without usability | |
| deteriorates as it is changed repeatedly | |
| does not wear out with use like other engineering artefacts | |
| has quality which is only as good as its lowest-quality reusable component | |
| is hard to change correctly | |
| is intangible | |
| is more reliable if it has fewer failures | |
| is designed usually for human beings to use | |
| must be designed with users' input otherwise it may not be usable | |
| often has a poor design and is steadily becoming worse | |
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