What is control of error in Montessori?
Control of error is a feature built into Montessori materials that lets the child see and correct their own mistakes without adult correction. For example, the knobbed cylinders only fit their own holes, so if one is left over, the child knows something is wrong. This supports independence, concentration and self-confidence.
What this means in practice
Because the material shows the error, the teacher doesn't need to say 'wrong'. The child stays in control of their learning.
Examples
- Knobbed cylinders: one cylinder won't fit
- Pink tower: the tower looks uneven
- Puzzle maps: pieces don't fit
- Matching cards with a control chart
- Pouring: spilled water shows imprecision
When there is no built-in control
Teachers provide control cards or answer charts, or check work during a later lesson.
Practical next steps
- Identify the control of error in each material you use.
- Resist correcting children mid-task.
- Add control cards where needed.
- Observe self-correction.
What to keep in mind
If a child cannot see the error, the material may be too advanced.
Common follow-up questions
Why not just tell the child?
Self-correction builds independence and confidence.
Does every material have a control?
Most do; others use control charts.
Sources
- Maria Montessori, The Montessori Method (1912), Project Gutenberg
- Association Montessori Internationale (AMI)
Examples are educational illustrations with made-up names. How these answers are prepared.