Observation No. 05
A photograph can do two jobs.
A builder takes a photo of a wall. In most businesses that photo does one job: it sits in a camera roll as a record, maybe, if anyone remembers why it was taken. In an assembly it can do two. The same image that records the wall attaches to the change order written against it, so the evidence and the paperwork become the same act.
This is a small thing, and small things are where assemblies actually live. The photograph simply became connected. One capture, two places, no second step. The builder did not file it twice or describe in words what the picture already shows. The work of recording and the work of documenting collapsed into a single motion on the walk back to the truck.
Most software treats a photo as a file to be stored. An assembly treats it as a fact that belongs in more than one place at once. The difference is whether the person has to carry the connection in their head, remembering to move the photo from phone to job to invoice, or whether the connection is built so the carrying is not required.
Look for the captures a business makes and then moves by hand: photos, signatures, measurements, notes. Each is a fact doing one job that could be doing two. The assembly is often just the wiring that lets a single act count everywhere it is already true.