The phrase "to prove the technique" means to demonstrate or show evidence that a certain method or approach is effective or successful. Full definition
Learn how to express yourself through letter writing - using proven techniques for creating positive relationships. (wholefamily.com)
Using proven techniques in resume and CV writing, cover letter creation and LinkedIn profile development, we will show you how to take your career to the next level. (vmsolu.com)
It is applying the well known and proven techniques of project management to legal cases. (morton-fraser.com)