B06 · Reference edition 2026.11
Four-flap folders — Definition and boundaries
A four-flap folder encloses a flat item through an ordered sequence of folds. The overlap arrangement determines access and closure.
Scope and purpose
Start by separating the named concept from adjacent concepts. Use the observation below to identify the question the record is intended to answer. Read the caution before applying the example. A definition is useful only when another reader can tell what falls outside it.
Working notes
This collection describes enclosure forms, access routes and documentation practices for paper-based material. It is intended for reading and planning, not for directing treatment of fragile objects. Fold diagrams and record examples are original illustrations with no associated collection or accession data. Material descriptions distinguish observed features from documented properties. Decisions about a real object, its condition and its environment require the relevant professional judgement.
Practical example
Number the lower, side and upper flaps on the reference diagram.
| Reference record | Interpretation |
|---|---|
| B06 | Four-flap folders |
| Scope and purpose | A four-flap folder encloses a flat item through an ordered sequence of folds. The overlap arrangement determines access and closure. |
| Limits and interpretation | A closure sketch does not establish the suitability of a board or adhesive. |
Review checklist
Write a one-sentence scope statement; identify a neighbouring concept; record what the example does not establish.