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D'une part vs. Premièrement: how to choose

Both can open an argument. D'une part normally sets up the paired expression d'autre part; premièrement introduces the first item in an open-ended numbered sequence.

The decision: Presenting two balanced sides? -> d'une part ... d'autre part. Numbering two or more points without that balance? -> premièrement, deuxièmement, etc.

The choices at a glance

ChooseWhen to use itPattern and example
D'une part Exactly two points, and you will pair this with 'd'autre part' later. D'une part, le télétravail réduit le temps de transport.On the one hand, remote work reduces commuting time.
Premièrement More than two points, or you don't yet know how many — extendable to deuxièmement, troisièmement. Premièrement, le télétravail réduit le temps de transport.Firstly, remote work reduces commuting time.

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