(1) Questions should be closely linked to the learning objectives in the lesson;
(2) Questions should be staged so that the level of challenge increases as the lesson proceeds;
(3) There should be a balance between closed and open, lower-order and higher-order questions;
(4) Wait time is important to allow students to think through their answers;
(5) Students should be provided opportunities to ask their own questions and seek their own answers;
(6) A secure and relaxed atmosphere of trust is needed and students' opinions and ideas are valued.