When using Self Serve workflows, you may wish to restrict your users from claiming too many projects to work on at the same time. If that were to happen, then you may find that the linguist who claimed too many projects is overstretched, whilst other linguists have nothing to work on.
This is avoidable using Assignment Limiting. In the Workflow section of team settings, you're able to set different limits for projects that are In edit and In review, meaning that your linguists and reviewers can only work on the number of projects that you set. In order to pick up something else, linguists and reviewers will need to approve or leave the captions they're working on, making way for others.