The process part
Print, place, reflow, inspect and test. It scales with placement count, pitch and the number of assembly passes.
The DIP part
Through-hole insertion plus selective or wave solder. Labour content depends on lead count and whether parts are hand-inserted.
The material part
The BOM at quoted quantities, with manufacturer and lead time stated. This is where most of the difference between quotes appears, so it deserves the closest reading.


