A ‘traffic light’ method has been successfully used by several schools that wanted their teachers to gain a greater insight into the psychological state of students at different stages during the day. The hope was that by gaining this — usually hidden — information, teachers would be able to modify their practice in order to help students to enjoy a better climate for learning and thereby enter their Effective Learning Zone.
The system works by every teacher being issued with green, amber and red traffic light symbols for student use. When prompted, students hold up the traffic light that best sums up how ready they feel to learn. This gives them an immediate and confidential way to give feedback to the teacher about their readiness for learning.
From ‘Creative Teaching and Learning Toolkit’ by Brin Best & Will Thomas (2007) Read more here