What is the jigsaw principle in Keith communicative methodology?

There is no established "jigsaw principle" in Keith's communicative methodology. It's possible that there is a misunderstanding, or the term is used in a specific context within a particular work by Keith.

To better understand what you're looking for, could you please provide more information? For example:

* Who is "Keith"? Is this referring to a specific author or educator? Please provide their full name or a more specific title, like "Keith Johnstone, the improvisational theatre expert."

* What is "communicative methodology"? Is this a specific type of teaching approach, or a broader concept?

* What is the context? Where did you encounter this term? Was it in a book, article, lecture, or other source?

With more context, I can help you find the information you're seeking.