To become an indeterminate employee after you've been a term employee, it's automatic if you have uninterrupted service after three years. It is only fair at the end of the day that if you've been giving your time and effort to the government on a term basis, you're converted to indeterminate status automatically. But to become a term employee, there is a full competition.
For casual employees, it's not exactly the same. There is no competition. The issue is that you can only be hired for 90 days within one department.