The planning phase
The planning phase is by far the most important phase for a register, where thorough work should be done. What kind of register do I want to establish, and what is the purpose of the register?
Good planning will significantly improve the quality of register data and increase the use of the data collected. It is therefore important to think carefully about whether the purpose of the register is only research, whether it is only quality assessement of clinical treatment, or whether it is a combination of these two purposes.