This article argues that teachers as professionals should be aware of the importance of profes­sional development since professional development is a key tool that keeps teachers abreast of current issues in education, helps them implement innovation, and refines their practice. Reflective practice, one of which is compiling teaching portfolio, could be the basis for professional development. By as­sembling the teaching portfolio teachers can reflect on their past and plan for their future action. Teach­ing portfolio could be assembled for the purpose of promotion or self assessment.