The conditions that increase the risk of violations can differ from those that produce errors. Violations are often associated with time pressure, poor procedures, poor supervision, and shortages of equipment or spares. The table below shows some reasons people gave for not following procedures in one study.
Source: Human Reliability Associates Ltd (from CAA CAP 716)
| Procedures are not followed because … | % agreeing |
| People prefer to rely on their own skills and expertise | 76 |
| People assume they know what is in the procedure | 70 |
| If they were followed to the letter, the job could not be done in time | 62 |
| People are not aware that a procedure exists for the job they are doing | 57 |
| It is difficult to locate the right procedure | 50 |
| They do not describe the best way to carry out the work | 48 |
| They are too restrictive | 48 |
| It is difficult to find the information you need within the procedure | 48 |