| Seat height | When seated, students should be able to rest their feet flat on the floor or on a footrest, with knees comfortably bent. | A suitable fit can support a stable sitting position and reduce pressure caused by dangling feet or an unsuitable seat height. | Percentage of students whose feet are supported and whose seat height can be adjusted or matched to their body size. |
| Seat depth | Students should be able to sit back against the backrest without the front edge of the seat pressing into the area behind the knees. | An appropriate seat depth helps students use the backrest while keeping the backs of the knees clear. | Whether students of different body sizes can sit back comfortably with space between the seat edge and knees. |
| Desk height | With shoulders relaxed, the desk should allow students to write or use learning materials without repeatedly hunching or raising their shoulders. | A better desk-to-chair fit can support a more comfortable working posture during seated tasks. | Observed shoulder position and trunk posture during typical writing and reading activities. |
| Back support | The backrest should support the student’s back while allowing a comfortable range of movement. | Supportive seating may make it easier to maintain a comfortable seated posture; it should not be treated as a substitute for movement. | Student-reported comfort and whether the backrest accommodates different seated postures. |
| Furniture size range | Provide multiple sizes or adjustable furniture so the fit can accommodate students of different ages and body dimensions. | A range of sizes can reduce the likelihood that one fixed furniture size is unsuitable for a substantial part of a class. | Fit checks across student height groups; record how often chairs, desks, or footrests need to be changed. |
| Movement and classroom flexibility | Choose stable furniture that can be repositioned safely to support different classroom activities and posture changes. | Changing position and taking movement breaks can help avoid prolonged uninterrupted sitting; furniture alone does not guarantee these benefits. | Availability of clear movement space and the number of lessons or activities that allow students to change position. |
| Safety and durability | Select furniture that is stable, free from sharp or damaged edges, easy to maintain, and compliant with applicable local safety requirements. | Routine inspection and appropriate maintenance help reduce avoidable hazards and keep furniture usable over time. | Inspection records, repair frequency, and the proportion of furniture meeting the school’s safety checklist. |
| Standards and procurement | Use recognized school-furniture dimensional and safety standards where applicable, such as EN 1729 in relevant markets, alongside in-class fit testing. | Standards can inform product selection, while direct fit checks help confirm that furniture suits the students who will use it. | Documented standard compliance, sample fit-test results, warranty terms, and maintenance requirements. |