This is the 3786th most frequent Japanese word.
にあたって
"にあたって" means "on the occasion of" or "in preparation for."
Here, 'にあたって' emphasizes a critical moment of starting an effort or initiative.
このプロジェクトを開始するにあたって、皆さんの協力が必要です。
As we begin this project, we need everyone's cooperation.
'にあたって' here highlights preparation or actions required during a transitional phase in one's career.
転職活動を行うにあたって、履歴書を見直す必要があります。
In the process of changing jobs, it is necessary to review your resume.
This usage of 'にあたって' stresses the importance of formal preparations and consultations preceding an implementation.