Last week we did a large training (4 days, 40 people, 4 coaches) for an international company.
Although the official company language is English, we realized that talking for 4 days in English was hard for most participants. To help our students with this, my colleague Deborah Preuss came up with the concept of referee cards:
The concept is this:
Every one at the course got a yellow and a red card. When someone was talking too fast for you, you show the yellow card. When the person talking used a word you do not understand, you show the red card.
I already printed out this picture and placed copies in all our meeting rooms.