When using categorising as a working form with students aged 6 to 8, the teachers can easily differentiate at three levels: beginner, advanced and expert. 

• Beginner learners (6-7 years old): benefit from concrete material, clear visual support and pre-given categories, such as “animals” or “food”. They mainly practise recognising and simple sorting. 
• Advanced learners (8-9 years old): can already think up categories independently, work with doubtful cases and use multiple sorting criteria, such as colour, function or theme. 
• Expert learners (9–10 years old): are challenged to make abstract or multiple sorting, argue their choices and compare alternative classifications. This way, you tailor the work form to each student’s thinking and language level and encourage critical thinking.