Accessioning is the formal act by which an object legally and permanently enters a museum's collection. It is distinct from mere physical receipt: an object can be in the building for months before - or without ever - being accessioned. Getting this boundary right protects legal title, insurance cover and the integrity of the permanent record.

In Spectrum terms the sequence runs from Object entry (recording arrival and the reason for it) through Acquisition and accessioning (transfer of title and assignment of a permanent number). Skipping or blurring these steps is the single most common source of collections liability.

Object entry before accession

Every object crossing the threshold - for consideration, loan, enquiry or gift - needs an entry record and a receipt. This establishes a chain of custody and a return position if the object is not acquired.

  • Unique entry number and date of receipt.
  • Depositor's name, contact and the reason for entry.
  • Agreed terms and a signed receipt for both parties.

Transfer of title and the accession number

Legal ownership must pass in writing - a signed transfer of title, gift agreement or purchase record - before accessioning. Only then is a permanent accession number assigned. The prevailing international convention is the tripartite number (for example 2024.15.3: year, acquisition group, item), which is durable, sortable and human-readable.

Due diligence at the point of entry

Accessioning is the right moment for provenance and legal checks, because reversing an acquisition later is costly. Practitioners screen against the 1970 UNESCO Convention on illicit cultural property, check export/import documentation and, where relevant, protected-species controls under CITES. Record the evidence you relied on, not just the conclusion.

In practice. Never assign an accession number until signed transfer of title is in hand. If title is unclear, keep the object on the entry (loan-in) register instead - an accessioned object is far harder to return than an un-accessioned one.

Marking and the permanent file

Each object is marked or labelled with its accession number using reversible, conservation-safe methods, and a permanent accession file is opened holding the transfer document, entry record, valuation and correspondence.

Key takeaways

  • Physical receipt and accessioning are separate acts - record entry first, accession only after title transfers.
  • Use a durable, structured accession number and assign it only once ownership is documented.
  • Do provenance and legal due diligence (UNESCO 1970, CITES) at accession, and keep the evidence.

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Last modified: Saturday, 1 August 2026, 10:37 AM