Why Testing Can Only Detect The Presence Of Errors NOT Their Absence?

Why Testing Can Only Detect The Presence Of Errors NOT Their Absence? Dijkstra actually first observed that testing can only show the presence of errors, not their absence. WHO stated that testing can only show the presence of errors NOT their absence? Dijkstra actually first observed that testing can only show the presence of errors,

What Happens During The Walkthrough Activity In Agile Testing?

What Happens During The Walkthrough Activity In Agile Testing? Walkthrough is a method of conducting informal group/individual review. In a walkthrough, author describes and explain work product in a informal meeting to his peers or supervisor to get feedback. Here, validity of the proposed solution for work product is checked. What is a walkthrough in