
die Mitarbeit
collaboration
Active participation and involvement in a shared task, a project, or a company.
Wir danken allen für ihre engagierte Mitarbeit am Projekt.
We thank everyone for their dedicated collaboration on the project.
collaboration
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collaboration
Active participation and involvement in a shared task, a project, or a company.
Wir danken allen für ihre engagierte Mitarbeit am Projekt.
We thank everyone for their dedicated collaboration on the project.

with contributions from
A phrase that indicates that someone contributed to the creation of something (e.g., a book or a film).
Der Bericht entstand unter Mitarbeit mehrerer Experten.
The report was created with contributions from several experts.
The word 'Mitarbeit' (collaboration) is made up of the preposition 'mit' (with) and the noun 'die Arbeit' (work). It literally means being involved in work and taking part.
Ohne die Mitarbeit aller Kollegen schaffen wir das nicht.
Without the collaboration of all colleagues, we won't manage it.
'Mitarbeit' (collaboration) is an abstract noun and is almost always used in the singular. It describes the act of contributing in general.
Der Chef bedankte sich für die gute Mitarbeit im letzten Jahr.
The boss thanked everyone for the good collaboration over the past year.
To say what someone is collaborating on, you use the preposition 'an' followed by the dative. The structure is: die Mitarbeit an [etwas] (collaboration on [something]).
Die Mitarbeit an diesem Forschungsprojekt war sehr interessant.
The collaboration on this research project was very interesting.
The expression 'unter Mitarbeit von' (with contributions from) is a fixed phrase. You often find it in books, films, or reports to name the contributors.
Dieses Buch entstand unter Mitarbeit zahlreicher Wissenschaftler.
This book was created with contributions from numerous scientists.
collaboration
Zusammenarbeit emphasizes that several participants work together reciprocally. Mitarbeit refers to a person's or group's share of the work or active participation in a larger undertaking. When expressing thanks, the choice therefore depends on the type of contribution being acknowledged.

Die Projektleiterin dankt Nina für ihre zuverlässige Mitarbeit am Projekt.
The project manager thanks Nina for her reliable contribution to the project.
Die Projektleiterin dankt beiden Teams für die gute Zusammenarbeit.
The project manager thanks both teams for their good collaboration.