# CountBench guides and demonstrations

Learn CountBench tasks, handle common problems and practise with checked demonstrations using sample data.

Source: https://help.smartfact.ai/countbench

Read a guide below, or use the help page to ask a general product question. Interactive demonstrations run on desktop and laptop computers. Written instructions work on any device.

## Guides and help pages

- [Correct a total with a reason](https://help.smartfact.ai/countbench/guides/correct-a-total): Reject a negative quantity, then replace a previously accepted total with a recorded explanation.
- [Count items and record a real zero](https://help.smartfact.ai/countbench/guides/count-and-zero): Practise counting known items, recording a checked zero and reviewing missing counts.
- [Hold an unknown item for review](https://help.smartfact.ai/countbench/guides/unknown-item): Unknown scans wait for review and do not change known stock quantities.