By Olivia Johnston, Becky Taylor and David Pomeroy* of

File photo.

Analysis - Educators have long debated whether students should be "streamed" - or organised into different classes based on their academic performance.

Is it better for students to be learning with students of a similar "ability", or a mix?

In Australia, most high schools stream students according to their ability, especially for maths. Streaming can also occur in the primary years.