Invarability and situationality of instruction are different images which are viewed respectively from preexisting thinking and generative thinking. Instruction is the integrity of invarability and situationality. With the extreme swelling of rationalistic thinking, people are infatuated with invarability and overlook situationality. Emphasizing situationalitv of instruction is rectification of traditional thinking that regards invarability as the only character of instruction. Invarabilitv is used to depict static state of instruction, while situationality is used to describe dynamic state of...