Re: Orthogonal requirements

Responding to Trichecoiob...

I read that requirements must be measurable, universal, and

"orthogonal"... I do not grasp the meaning...
any example ?

I agree with Berard's explanation.

But I think "atomic" or "unique" would be better choices of words for your source. The key idea is that each requirement is defined at a low enough level of abstraction that it can stand on its own independently of other individual requirements. IOW, each requirement defines a unique bit of functionality _compared to other requirements at the same level of abstraction_.

However, requirements are quite often closely related. Use cases are an example of explicitly organizing requirements together when they are intimately related through a more abstract (coarse-grained) functionality. When individual requirements are closely related in this manner, I think it is tough to argue that they are orthogonal.


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