Jeff Sutherland on Scrum/Agile – Ten Year Agile Retrospective: How We Can Improve In The Next Ten Years:
"Industry data shows that fixing bugs on the same day as they are discovered will double the velocity of a team.
[…] Traditional project management assumes that users know what they want before software is built. As a result, over 65% of features built are either rarely or never used by the customers. This problem was formalized as "Humphrey's Law", yet it is systematically ignored in university and industry training of managers and project leaders.
[…] Getting product backlog ready requires professional product managers that understand user needs and team capabilities with a passion for delivering excellence. Getting product backlog done in a sprint requires prioritizing work, continuously integrating work in progress, and intolerance of defects. Demanding technical excellence is the top priority for the next ten years."