Testing theory — The myph or reality?

Ksenia and Alexander will give a presentation in the form of a discussion on the topic of testing theory.

According to the HH, no one needs testers without knowledge of testing theory. But what is the testing theory? Test design techniques and bug reports? What is the use of this theory if the employee has a bunch of certificates, and on the project, he is of no use? We will figure out what a tester should learn if we can prove that testing theory is a myth.