PISA is the OECD’s Programme for International Student Assessment. Organization for Economic Co-operation and Development (OECD).PISA measures 15-year-olds’ ability to use their reading, mathematics and science knowledge and skills to meet real-life challenges. PISA is an international study which began in the year 2000.The survey for PISA is conducted every 3 years. Each student takes a two-hour computer based test.