Walking the whole site with the person who is going to design it, not with a salesperson. You look at where the sun falls at eight in the morning and where at six in the evening, what moves in the wind, what a lorry blocks when it parks, where people actually get in when nobody is looking, where the power comes from and where a cable can run without chasing out half a wall. And you look at what is already installed, in what condition and with what documentation.
It takes as long as the site takes. An industrial unit with two entrances can be seen in a morning; a building in use, with several storeys, different shifts and installations from three different eras, cannot. What is not done is designing from a drawing and a list of requirements dictated over the phone: it is the most reliable way to find out on installation day that the camera on the drawing is looking at a column.
The visit also produces a list of questions, not just measurements. Who opens up in the morning, who is the last to leave, what happens when the bin lorry comes, who has a key to the plant room. Half of what you need to know is there, and none of it is visible on a wall.
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