The POS can tell you:

• what
  sold
• what
  time
• what the theoretical food cost is (the best POS can show this)

But it can’t tell you:

• what
  was over-portioned by the staff
• what
  got spilled, burnt, mis-made
• what
  was comped and not rung up
• what
  got thrown away
• what
  got stolen (yes… it happens)

That’s why “my reports look fine” isn’t enough.

Profit comes from operations discipline, tracking and not just reporting.