The system shall react to < type of accident or hazardous condition > by performing < type of action! s) >

The system shall < time out, log out. lock > access to < data, asset, function > after < defined time period > of inactivity

< quantity > of user < error type > mistakes made by a < user type or role > per < time unit > under < defined conditions >

< mean time or average time > for a < defined product or component > to experience < defined failure type > under < defined conditions >