Original:  A pilot study asks the same questions, but also has a specific design feature: in a pilot study, a future study or part of a future study is conducted on a smaller scale . Sandra M Eldridge, Gillian A Lancaster, Michael J Campbell, Lehana Thabane, Sally Hopewell, Claire L Coleman, Christine M Bond.
Revised:  A pilot study asks the same questions, but also has a specific design feature: in a pilot study, a future study is conducted on a smaller scale . Sandra M Eldridge, Gillian A Lancaster, Michael J Campbell, Lehana Thabane, Sally Hopewell, Claire L Coleman, Christine M Bond.
Edit intent: clarity