tab. It is assigned afresh whenever the document is re-analysed (see [Bulk-edit metadata across many documents](/how-to-guides/review/bulk-edit-metadata.md) for how to re-run the AI on selected documents).
To work with it, open the **Classes** group in the left-hand panel of the tab: it lists the classes present in the matter, each with its document count for the whole matter, and ticking a class narrows the list to those documents.
A document with no class does not appear in the group, and is hidden whenever any class is ticked. How class ticks combine with folder and label ticks is described in [Folders, labels, and collections](/reference/folders-labels-and-collections.md).
If classifying a document fails, or the AI returns a value that is not on the list, the **Classes** group can also show an extra entry that is not one of the classes below. The documents under such an entry have not been given one of the listed classes.
## How a class is chosen
The AI is instructed to follow these rules:
* A document is classed by what it **is** — its form and legal function — not by what it discusses.
* An email is classed **Email** even when it attaches or refers to an agreement, an affidavit or another document.
* A letter demanding payment is classed **Correspondence**, not **Invoice**.
* A board resolution approving an agreement is classed **Minutes Report**, not **Agreement**.
* A document that fits none of the classes is classed **Other**.
## Which dates show a time
The class decides whether a document's date carries a time of day:
* An **Email** is dated when it was sent — a single date, never a range — and the date carries the time and time zone when the email shows them.
* Every other class is dated without a time.
## The classes
The 34 classes, in the order the **Classes** group lists them.
| Class | What it covers |
| ----------------- | ------------------------------------------------------------------------------------------------------------------------------------ |
| Agreement | Contracts, deeds and other bilateral contractual instruments with named parties and signature or execution blocks. |
| Authority | Reported case law, statutes and other legal authorities. |
| Bill | Quotations, estimates, pro-forma invoices and price proposals issued before any payment is due. |
| Bill Of Lading | Bills of lading and other shipping or consignment documents in that form. |
| Book | Pages from published books. |
| Certificate | Official certificates issued by an authority or institution. |
| Charter Doc | Maritime charterparties and charter terms. |
| Corporate Docs | Incorporation documents, company registers, statutory filings and constitutional documents. |
| Correspondence | Formal letters and faxes not covered by another class. |
| Court Bundle | Compiled bundles — core, common, appeal and authorities bundles. |
| Court Document | Court pleadings and filings not covered by another court class: submissions, judgments, statements of case, petitions and memoranda. |
| Court Transcript | Transcripts, notes of evidence and records of proceedings. |
| Credit Note | Credit notes and credit memos. |
| Delivery Order | Delivery orders and delivery instructions. |
| Drawing | Technical drawings, plans and schematics. |
| Email | Emails and email printouts. |
| Graph Chart | Pages that consist mainly of graphs or charts. |
| Id Doc | Passports, NRICs and other national identity documents. |
| Invoice | Invoices requesting payment for goods or services already provided. |
| Messaging | Chat and message logs, and screenshots of messaging apps. |
| Minutes Report | Meeting minutes, resolutions, agendas and formal reports. |
| News Press | News articles and press releases. |
| Note | Internal notes and memos without a formal letterhead. |
| Other | Documents that fit none of the other classes. |
| Payment Evidence | Receipts, payment confirmations, transfer slips and cheque copies. |
| Personal Record | Medical and other personal records. |
| Photo Video | Photographs, video stills and screenshots of audio records. |
| Policy | Policies, standard operating procedures, manuals, guidelines, and insurance or compliance terms. |
| Presentation | Slide decks. |
| Proof Of Delivery | Delivery confirmations and signed acknowledgements of receipt. |
| Purchase Order | Purchase orders. |
| Searches | Registry-generated extracts and search results. |
| Statement | Account statements and periodic transaction listings. |
| Witness Evidence | Affidavits, witness statements and AEICs. |
## Related
| Document metadata fields | The document fields you can edit in the Review tab and their accepted values. | Document metadata fields |
| Folders, labels, and collections | How folders, labels, and collections organise documents in a matter. | Folders, labels, and collections |
| How AI analysis works | What agents and playbooks are, and what they extract. | How AI analysis works: agents and playbooks |