It depends on the application. Either way you are guaranteed a perfect fit from Coverking.
Some seat covers are designed as a one piece cover. To install these you will first need to pull the lean back portion all the way over and down the seat. Then you will run the straps in between the cushion and lean back. Attach the strap clips together and tighten pull strap. Tilt the lean back all the way towards the rear row and tuck all excess material in between the cushion and lean back and return backrest to desired position.
View this installation video which shows a one-piece 50/50 bucket seat cover installation.