Teaching tools for learning for understanding

One of the very important ideas that form a part of the teaching for understanding (TFU) framework is the idea of creating opportunities to demonstrate learning in the classroom. David Perkins and the TFU group out of Harvard call these "understanding performances" or "performances of understanding". It occurs to me that perhaps I can create learning tools to use in my classrooms that help "make learning visible" (another idea from the TFU framework and working group), especially when I am working with young learners who aren´t so able to articulate what they have learned.