This year, teachers of each subject are engaged to design tiered assignments based on students'learning difficulties in order to cater for learning diversity and teach students in accordance with their aptitudes. To further enhance teachers' professionalism and provide opportunities for peer evaluation, the 3rd Teacher Professional Development day was held on 神May, 2021. A sharing and feedback workshop on tiered assignments was the theme of morning session. Teachers from different subjects first took turns to share their ideas, and then gave feedback and opinions on the sharing of other subjects. All teachers prepared their sessions and learnt among others'sharing. A workshop focusing on "relieving waist and knee pain" hosted by Mr. So SH from the "Vitality 50+ Project" was organized in the afternoon. Through this workshop, teachers not only could understand more about the common symptoms caused by waist and knee pain, but also learnt some correct positions and exercises of stretching muscles to stay healthy.