Summary of the possible processes involved in omitting a necessary
| Level of failure | Nature of failure | Failure type |
|---|---|---|
| Planning and intention formation | • A necessary item is unwittingly overlooked | Mistake |
| • The item is deliberately left out of the action plan. | Violation | |
| Intention storage in prospective memory | • The intention to carry out the action(s) is not recalled at the appropriate time | Lapse |
| Action execution | • The actions do not proceed as intended and a necessary item is unwittingly omitted from the sequence | Slip |
| Monitoring | • The actor neither detects nor corrects the prior omission | Slip or violation |