Questions checking the successor's understanding - handover @ ウィキ

Hiro was a person in charge of financial system for many years, but was ordered to overseas assignment, it was decided to hand over the successor Kei. The financial system is an important system and it is desirable that Kei understand evenly the system. Kei has heard the explanation from Hiro, but Hiro does not know whether Kei understands the explanation.

Is there a way to confirm how much the successor the understand the explained knowledge?

The explaination tends to be unilateral information dissemination, and Hiro do not know well whether Kei really understands it.
Sometimes, even Kei does not know whether she understands the explanation or not.

Ask simple questions to try out if the predecessor really understands the explanation by the predecessor.

Hiro asked a question to confirm the knowledge of Kei.
As a result, Hiro could explain the knowledge effectively.

It is not necessary to execute this pattern if the successor uses Immediate questions on the unclear spot. To do this pattern it is also important to have awareness as a Mentor for successor. It is also effective to deepen the understanding of successors by also doing Incremental handover.