How The Nicomachean Ethics drew on The Republic

A documented line of influence: Aristotle demonstrably engaged Plato’s work. The commentary below is Gröblé’s, verbatim from each work’s page.

Plato · c. 375 BCE

Aristotle · c. 330 BCE

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On The Nicomachean Ethics’s page

The Ethics defines itself against the Republic from its opening pages
Aristotle, Plato's pupil of twenty years, names the Republic's 'Idea of the Good' in Book 1.6 and takes it apart — the good is too many different things to be a single Form, and no use to a doctor or carpenter even if it were
Read the Republic first to meet the claim Aristotle is refuting: his empirical, this-worldly ethics is a direct answer to Plato's transcendent one

The book Aristotle spent twenty years in Plato's Academy absorbing — and then opened the Ethics by attacking
The Republic's central metaphysics, the Form of the Good, is the exact target: Aristotle names it in Book 1.6 and dismantles it, arguing the good is too many different things to be one Idea
His teacher built ethics on a transcendent Form; Aristotle, in answering him, grounds it empirically instead — useless to a doctor or carpenter even if it existed, he says