When was ISIC Rev. 5 endorsed?

ISIC Rev. 5, UN Statistics Division, was endorsed by the UN Statistical Commission in March 2023, which is the formal approval date to cite for the revision. Endorsement is not the same as instant adoption everywhere: national statistical offices then plan their own implementation timetables. A methods note should give the March 2023 endorsement date for the international standard and, separately, the adoption date for any national dataset being used.

What does endorsement by the UN Statistical Commission mean?

Endorsement is the formal approval that turns a draft revision into the international standard, and the opening paragraph dates it precisely: ISIC Rev. 5, UN Statistics Division, was endorsed by the UN Statistical Commission in March 2023. The Commission is the body whose approval gives the revision its standing as the international recommendation, which is why March 2023 is the date to cite in a methods note when the question is when the standard itself was approved. Other dates in the revision story, such as drafting milestones or publication dates, answer different questions and should not be substituted for the endorsement date.

Why is endorsement not the same as adoption?

The opening paragraph draws this distinction in its second sentence, and it is the distinction most often collapsed in casual writing. Endorsement approves the international standard. Adoption puts that standard to work inside a national statistical system, and adoption is a national decision with a national timetable. Between the two lie questionnaire redesign, coder training, register recoding, back series work, and coordination with related classifications. Each step takes time, and the total time varies by country, as the companion guide on national implementation explains in detail.

Collapsing the distinction produces a specific error: a methods note that cites March 2023 as if it were the date a dataset switched to Rev. 5. A dataset published in, say, the year after endorsement may still rest on an earlier national classification, because its national office had not yet completed adoption. Conversely, a dataset published before March 2023 cannot rest on the endorsed Rev. 5, whatever its release notes may suggest by loose wording. The endorsement date describes the standard. The adoption date describes the dataset. Both dates belong in a careful methods note, labelled as what they are.

How should a methods note give both dates?

A methods note that handles this well gives the two dates in separate clauses, each with its own subject. One clause states that ISIC Rev. 5, UN Statistics Division, was endorsed by the UN Statistical Commission in March 2023. A second clause states the adoption date for the national dataset being used, or, where adoption was phased, the dates for the tables or series actually cited. Keeping the clauses separate prevents the reader from merging them into a single, wrong date, and it lets a later reader update one clause without disturbing the other.

Where the national adoption date is unknown, the note should say so rather than borrowing the endorsement date to fill the gap. An unknown adoption date is a limitation, and limitations stated openly can be worked around, for example by checking the national office’s documentation or by treating the series as mixed-basis until confirmed. An endorsement date presented as an adoption date is a false precision, and false precision misleads every reader who trusts the note.

What mistakes cluster around the March 2023 date?

Three mistakes recur. The first is dating the revision to the wrong year by memory, often by a year or two in either direction, which matters because a wrong year can place a dataset on the wrong side of the endorsement line. The second is treating endorsement as the moment Rev. 5 figures first appeared, when in fact figures appear only as national offices adopt and publish. The third is the reverse: treating a national adoption date as the endorsement date, which understates the standard’s history and confuses readers comparing countries with different timetables.

Each mistake is preventable by the same habit, which is to check the date against the UNSD material before writing it, and to write it with its subject attached: endorsed by whom, adopted by whom, for what dataset. Dates without subjects drift. Dates with subjects stay put, because a reader who sees “endorsed by the UN Statistical Commission in March 2023” can verify the claim, while a reader who sees only “2023” cannot tell what happened in that year.

This guide is general statistical information about a revision date. It does not assign a code to any reader, determine anyone’s principal activity, or decide a registration question; those matters for a specific record rest with the national statistical institute or business register holding it.