Kennedy set the date before anyone knew how. The deadline is what produced the method.
Named after John F. Kennedy's 1961 commitment to land a man on the Moon before the decade was out.
Commit publicly to a specific outcome and a specific date, before you know how you will do it. The commitment is what forces the how to be worked out.
In 1961 Kennedy committed the United States to landing a man on the Moon and returning him safely before the decade was out. Nobody knew how. The commitment came first, and the method was invented to meet it.
The principle for a business: a goal that is specific, public and dated changes behaviour in a way that an aspiration does not. 'Grow the business' commits you to nothing. 'Two hundred clients by December, and I have told the team' does.
The date removes the option of indefinite postponement. The audience removes the option of quietly dropping it. Together they convert intention into constraint, and constraint is what produces invention.
The uncomfortable half: a public dated goal can also be publicly missed. That is the price, and it is the reason the technique works at all.
Useful as a contrast with SMART goals — this is deliberately not 'achievable' in the SMART sense.