When you choose individual assignment, each included participant will be randomly assigned a condition.
When you choose group assignment, you then choose one of the group types defined in the Context Metadata. Each group will be randomly assigned a condition and each participant in a group will receive the same condition.
When you choose within-subjects assignment, every time a participant marks a decision point, they will receive a new condition. You can choose what kind of ordering you want for the conditions. Random will select a new random condition each time. Random Round Robin will randomly order the experiment conditions, and when it runs out of conditions, will create a new random ordering. Ordered Round Robin will deliver the same sequence of conditions over and over again.
