〜にあたって
when (about to take an important step)
Noun / Verb dictionary form + にあたって / にあたり
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にあたって introduces an important step or new start, usually with what you do to prepare for it: 新しい事業を始めるにあたって、市場調査を行った, "before starting the new business, we did market research".
It's formal, and it's the classic opening of speeches and greetings: 開会にあたり、一言ご挨拶申し上げます, "as we open, allow me to say a few words".
The first half is something significant: starting a job, opening an event, writing a thesis, moving house. The second half is a preparation, a resolve or a formal statement.
にあたり is the more formal version. It overlaps heavily with に際して; にあたって leans more towards getting ready for what's coming.
Examples
新しい事業を始めるにあたって、市場調査を行った。
Before starting the new business, we did market research.
開会にあたり、一言ご挨拶申し上げます。
As we open, allow me to say a few words.
引っ越しにあたって、たくさんの物を捨てた。
When I moved house, I threw away lots of things.
論文を書くにあたって、多くの本を読んだ。
To prepare for writing my thesis, I read a lot of books.
就職にあたって、スーツを買った。
I bought a suit for starting my new job.