11. I would request approx 20-40 user trial run. 12. The prototypes are currently under the user trials . 13. "But the truth is that we really won't know until we have extensive user trials ." 14. These are routine user trials , " he said. 15. User trials of the WLR began in 2005.16. It will now enter production phase, subject to user trials and acceptance by the Indian Army. 17. The gun is expected to start user trials in 2017 and production is expected to start in 2019. 18. The 5th Medium conducted the user trials of the new artillery piece in January 1942 at Larkhill, England. 19. The ease of use score was assessed in the laboratory as well as user trials by eight people. 20. The magazine's last month's issue rated six notebook computers, after putting them through laboratory tests and user trials .