01
Define the orientation before writing the dimensions
Draw the box with its opening facing upward. Label the long horizontal direction length, the shorter horizontal direction width and the vertical direction height. Put those labels on the drawing rather than assuming the reader uses the same order. Record the external values in the sequence length 32, width 22 and height 12 centimetres. Mark their source as supplied example values. In a real record, an observation date and method could identify how the values were obtained, while estimates should remain explicitly labelled as estimates.
02
Give internal clear space its own row
Record internal length 30, width 20 and height 10 centimetres in a separate row with the same orientation. Do not replace the external row or call the two sets interchangeable. The outside dimensions describe the box’s envelope; the inside dimensions describe the stated space within it. A lip, hinge or other obstruction could affect useful clearance, so leave an obstruction note beside the internal row. This example supplies no such detail. Mark that field unknown rather than assuming the opening and the full interior have identical clearance.
03
Preserve the questions needed for a fit decision
The reusable record contains object identifier, orientation sketch, external dimensions, internal dimensions, units, source and obstruction notes. If someone asks whether a particular item fits, add the item’s dimensions and required orientation as a separate record. Even a nominal dimensional comparison may leave questions about access through the opening, padding or handling clearance. Keep those questions visible until the necessary information or physical check exists. The worksheet provides a clearer handover of what is known; it does not turn the fictional dimensions into a verified fit result.