The job comes in on the phone. It gets written on a work order. The work order goes on the truck, comes back with the hours on it, and somebody types those hours into the scheduling program. Then, at the end of the week, that same somebody opens QuickBooks and types the whole thing in a second time to bill it.
Nobody planned this. Each piece got added for a good reason, a year or two apart, and none of them talk to each other. So the seam between them is a person, and the person is doing the same work twice.
The cost isn’t only the hours. It’s that the two systems drift. The address gets fixed in one and not the other. A job gets marked done in the scheduler and never makes it onto an invoice, and you find out in February when you’re reconciling and there’s $1,400 of work nobody billed. Then there’s the version question, which is the one that really wears people down: when the two disagree, which one is right? Usually the answer is whichever one your office manager updated last, and she’s the only one who knows.
The tell is when somebody says “let me just check the other one.” That sentence is the whole problem in six words.