Designed and developed Schools’ Assessment Designed and developed by the Australian Council for Educational Research (ACER), the International Schools' Assessment Program (ISA) is currently administered in 260 international schools worldwide with over 49000 students participating, and allows these schools to benchmark themselves against other international schools in the core skill areas of mathematical literacy, reading and writing. The ISA is a culturally inclusive test that provides meaningful and valuable information for education providers and the parents of students.