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| subject > requirement > non-functional requirement > platform | 
| platform comparison table | ||||
| Subject | is a kind of | describe | specify | has definition | 
|---|---|---|---|---|
| non-functional requirement | requirement | a constraint that must be adhered to during development | A requirement that constrains design of a system, but does not describe a service that the system is to provide | |
| platform | non-functional requirement | what hardware and operating system the software must be able to work on | the least powerful platforms and declares that it must work on anything more recent or more powerful | 
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