The Housing Executive and housing associations should only evict you if all other ways of solving a problem have failed. They have to follow the right process. This process depends on whether you've been a tenant for more or less than a year.
Your landlord must follow the correct legal process in order to evict you. If you have a fixed term agreement, your landlord will have to have a reason to evict you. However, if you're a periodic tenant your landlord simply has to follow the correct legal process.