BCG Real Life - Examples for client / partner emails

Hi everyone,

I am currently preparing for the BCG Real Life interviews. I know that you will possibly be asked to write an email to a client or a (senior) partner of the firm.

I was wondering whether you have some ideas for topics that these emails might have (really no need for real BCG examples, just trying to understand the scope of the task better). For example, I could think of:

• Partner: Executive summary
• Client: Convince them of something
• Partner/Client: Postpone something 

Do you have more ideas based on your experience with preparing candidates for the second round?

Many thanks in advance!