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Is a functional spec a part of the System requirement spec?

I wonder, sources like wikipedia or templates I found shows that Functional spec is a part of System requirement documents. I always thought that SRD is just overall decsription of the system, with all functional and non functional requirements. Yet I thought that Functional spec is more detailed and it is a separate document, while SRD is high level customer-created description (how is this one called then?)
Could anyone help to make this clear for me?

How do I survive in a Waterfall world? [duplicate]

This question already has answers here: How possible is it to estimate time for programming projects? [duplicate] (12 answers) Closed 11 years ago. I currently work in a company where the Waterfall model is deeply ingrained. We are pushing Agile principles but it’s a long process. Meanwhile, I have to work in a Waterfall world […]