In front of them, two boys are writing their own descriptions of someone else in their class. On the floor at the front are two circles, one group of students reading a story quietly, and another discussing the meaning of a different, more difficult story with their teacher. Below is a Maths version of the same setup.
Children were moved between these groups termly based on their progress and the area being studied (if for example they were better at handling data than algebra) and all knew what they were working towards as differentiated objectives for literacy and maths were stuck permanently on the wall.
In New Zealand, one year 6 class I saw didn't even stick to specific subject times. They had a task board on the wall of tasks the children had to complete over the course of the exit few weeks, and a checklist next to it with their names. The children could choose what activities they felt like working on, and tick them off as they completed them. Kids that needed more focus were given a narrower choice - they were given three tasks to complete that day but chose what order they completed them in.