In the past experts recommended one system. Now people prefer “best of breed”. Either way is acceptable as long as the systems are integrated so that data does not have to be re-entered. Ideally the user can see through one system into the other without having to log out and in to something else.
4. Data captured (entered) at source
Simply put, people are not filling in pieces of paper to pass to someone else to input into the system when they could easily have done it themselves eliminating the need for the form