Abstract
In an environment disrupted by technology, critical thinking is a crucial 21st Century Skill that allows learners to stay intact when any number of organizations (corporate, political, educational and cultural) try to influence readers to think and act in ways that serve their purposes (Brookfield, 2012). It has also been emphasized in the ATC21S project as one of the desired outcomes under 'Ways of thinking'. In this paper, we aim to share about how Design Based Research and DDMT teaching model can shape a chemistry lesson on water for Grade 5 learners. The lessons will be shaped towards guiding the learners in understanding acidity/alkalinity as required by the national curriculum and also seek to provide an insight into how young learners showcase development of critical thinking in the learning process.