Human error can be divided into either intentional or unintentional actions.
INTENTIONAL actions—those actions that involve conscious choices. These actions are primarily due to judgment or motivational processes.
UNINTENTIONAL actions—those in which the right intention or plan is incorrectly carried out or where there is a failure to carry out an action. These actions typically occur due to attention or memory failures.
Here is how James Reason illustrates the difference between UNINTENTIONAL and INTENTIONAL errors: