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Step one: pin down the single why
Start by writing the question a customer would ask if they met you: why does this business exist? Answer it in one plain sentence before drafting anything longer. Avoid answers like to deliver quality, which fit every company. Look for a specific frustration, event or observation. Example: a repair shop owner who kept watching neighbors discard working appliances might write, we started because throwing away a fixable toaster felt wrong. That sentence becomes the spine. Every later paragraph should either support it or be cut. If you find two competing reasons, choose the one a stranger would find easiest to believe.
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Step two: choose the moment that proves it
A reason becomes believable when attached to a scene. Pick one moment where the why became unavoidable: a conversation, a failed attempt, a problem you could not ignore. Describe who was there, what you saw and what you decided, using concrete details instead of adjectives. In the repair example, the scene might be a kitchen counter piled with broken appliances at a community cleanup, and the owner opening one up to find a loose wire. Keep it to a short paragraph. Resist the urge to include every early milestone; one clear moment carries more weight than a full chronology.
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Step three: connect the reason to today's customer
Close by linking the origin to what a visitor can do now. Say what the reason means in practice: how you work, what you will and will not do, and what the reader gains. For the repair shop, that could be a promise to quote the repair before the replacement and to explain each fix plainly. Then review the draft: read it aloud, remove claims you cannot support, and ask someone outside the business whether they can repeat the why in their own words. If they can, the story is ready for an about page, a pitch or a short video.