How can a ‘use case’ be used to create a data flow diagram? What is partitioning, and how is it used (identify two or three ways for determining partitioning in a data flow diagram)?

How can a ‘use case’ be used to create a data flow diagram? What is partitioning, and how is it used (identify two or three ways for determining partitioning in a data flow diagram)?

Requirements:

* Your discussion should be approximately 200 words.
* Correct grammar, spelling and punctuation are expected.
* Provide your sources of information (references).

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