Difference between revisions of "Secrets of understanding requirements"
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* Fred must include a ''NON''-picture or a song in an email | * Fred must include a ''NON''-picture or a song in an email | ||
* Fred must ''EXCLUDE'' a picture or a song in an email | * Fred must ''EXCLUDE'' a picture or a song in an email | ||
| + | * ''SOMEONE ELSE'' must include a picture or a song in an email | ||
| + | * Fred must include a picture or a song in a ''NON''-email | ||
Latest revision as of 16:01, 22 April 2020
Introduction
Word tricks
Negation and inversion
When requirements are hard to descern, you can get a better understanding by playing with words. Let's take a rather simple looking requirement:
- Fred must include a picture or a song in an email
Now, we can apply inverses at different points to change meanings. This allows us to ask questions:
- Fred MUST NOT include a picture or a song in an email
- Fred must include a picture AND a song in an email
- Fred must include a picture or a NON-song in an email
- Fred must include a NON-picture or a song in an email
- Fred must EXCLUDE a picture or a song in an email
- SOMEONE ELSE must include a picture or a song in an email
- Fred must include a picture or a song in a NON-email
