The first stage needed during the UX-Design workflow is to do some research on the topic that you are working on. This research is the most essential part of your work as it will be the foundation for everything that follows.
Before you work with the users it is always helpful to get started to do some research on your own to get some basic knowledge on the field you are working on in that project.find out more
If you are working on some very specific topics it can be helpful to work with just one single user at a time to get some detailed information on the topic that you would not get in a bigger group.find out more
If you want to get a big variety on thoughts it is advisable to work with multiple users at a time. They will influence one another and therefore the process is more representative.find out more