When setting up a review cycle, you will be asked to choose between 'Open' and 'Sequenced' cycles.
In an open cycle, all the steps you have selected will start at once. This allows the participants to update their reviews in real-time over the review period.
In a sequenced cycle, the steps will run in the order you have chosen, but when a participant has finished the step that is active, they can move on to the next step without having to wait for it to start.
An example of this would be a manager completing their own self-reflection and their team completing their self-reflection. The manager would be able to do the manager review (if that was the next step) before it was set to start.
Any reviews that existed before open reviews were an option will be sequenced by default.