The most effective type of praise has 3 important components: it needs to be private (meaning not to the general masses) when possible, it needs to be specific so the student knows exactly what they have done well, and it needs to be unconditional so it ends in a way that makes them feel positive, not negative.
Example of public: "Well done everybody! Today you were fantastic; you lined up perfectly! See you next time!"
Example of private: <to student> "Well done, you were brilliant today. You didn't give up even though that lesson was really tricky! <smile> See you next week!"
Example of public: "Well done everybody! Today you were fantastic; you lined up perfectly! See you next time!"
Example of private: <to student> "Well done, you were brilliant today. You didn't give up even though that lesson was really tricky! <smile> See you next week!"