What does "piece together" mean?

He was still sitting in the office all alone trying to piece together what had gone wrong.
In this sentence, What does “piece together” mean?

彼は、依然として職場に一人で残り、何がうまくいかなかったのかをーー個別の事柄をまとめてみることでーー全体的に理解しようとしていた。

“Determine,” “figure out,” with the implication that the failure came from a series of steps over a period of time.

The expression comes from the idea of trying to re-assemble something broken, like a ceramic mug.

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