Accessing to the general trend of the world, Vietnam is in the process of setting up a new General education curriculum oriented to learner competency development. In that curriculum, problem-solving is one of the common competencies that need to be formed and developed for students. Thus, developing and evaluating problem solving competency is one of the tasks that teachers in disciplines at all levels of learning and need to do. However, in in Vietnam nowadays, teaching of competency approach is still difficult for teachers. In this article, on the basis of research on competency, we have given a problem-solving competency development process in teaching biology at high school as an illustrative example.

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