
das Benehmen
behavior / manners
The way a person behaves in social situations, especially with regard to politeness, decency, and manners.
Sein schlechtes Benehmen bei der Feier hat alle schockiert.
His bad behavior at the party shocked everyone.
behavior / manners
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behavior / manners
The way a person behaves in social situations, especially with regard to politeness, decency, and manners.
Sein schlechtes Benehmen bei der Feier hat alle schockiert.
His bad behavior at the party shocked everyone.

to contact
(Formal, administrative language) To contact someone or an institution in order to clarify or discuss a matter.
Die Schule wird sich wegen der Angelegenheit mit den Eltern ins Benehmen setzen.
The school will contact the parents regarding the matter.
'Das Benehmen' (behavior/manners) is the nominalization of the reflexive verb 'sich benehmen' (to behave). This pattern, in which the infinitive of a verb becomes a neuter noun, is very common in German.
Er muss lernen, sich in der Schule besser zu benehmen.
He has to learn to behave better at school.
'Benehmen' (behavior/manners) is almost always combined with adjectives that evaluate the behavior. Common combinations are 'gutes Benehmen' (good manners), 'schlechtes Benehmen' (bad behavior), 'unmögliches Benehmen' (impossible/unacceptable behavior), or 'tadelloses Benehmen' (impeccable behavior).
Für diesen Job sind gute Umgangsformen und ein tadelloses Benehmen wichtig.
For this job, good manners and impeccable behavior are important.
The expression 'sich ins Benehmen setzen mit' (to contact / to enter into consultation with) is very formal and belongs to official or administrative language. It is practically never used in normal everyday speech.
Das Ministerium wird sich mit den betroffenen Verbänden ins Benehmen setzen.
The ministry will contact the affected associations.
This meaning exists only as a fixed expression: 'sich ins Benehmen setzen mit jemandem' (to contact someone / to enter into consultation with someone). The preposition 'mit' requires the dative here.
Bitte setzen Sie sich zur Klärung des Sachverhalts mit der Personalabteilung ins Benehmen.
Please contact the HR department to clarify the facts of the matter.
to amount to / to behave
Sich betragen and das Benehmen both describe how a person behaves in a social situation. Sich betragen refers more to a specific, often evaluated way of acting, while Benehmen refers more generally to social conduct and manners. Sich betragen fits a specific assessment; Benehmen describes the way someone interacts with others.

Das Benehmen der Kinder beim Besuch im Museum war sehr höflich.
The children's manners during their visit to the museum were very polite.
Die Kinder haben sich beim Besuch im Museum sehr ruhig betragen.
The children behaved very quietly during their visit to the museum.