The primary thing when you take a sword in your hands is your intention to cut the enemy, whatever the means. Whenever you parry, hit, spring, strike or touch the enemy’s cutting sword, you must cut the enemy in the same movement. It is essential to attain this. If you think only of hitting, springing, striking or touching the enemy, you will not be able actually to cut him.
The McNamara fallacy, named for Robert McNamara, the US Secretary of Defense from 1961 to 1968, involves making a decision based solely on quantitative observations (or metrics) and ignoring all others. The reason given is often that these other observations cannot be proven.
The fallacy refers to McNamara's belief as to what led the United States to defeat in the Vietnam War—specifically, his quantification of success in the war (e.g., in terms of enemy body count), ignoring other variables.
Prescriptive feedback limits creative collaboration. I’ve seen it time and time again, but I’ve struggled to articulate the exact reasons and their remedies. Recently, though, I got some insight from an unusual source: a game of chess.
In hand and brain chess, each team has two players: a “brain” and a “hand.” At the beginning of each turn, the “brain” tells the “hand” which piece to move, and the “hand” then has to move that piece, but can move it wherever they think it should go. No other communication is allowed.
In every feedback conversation, one person is the hand. That’s the person doing the design — they’ll leave the meeting and go back to their computer and fire up a dozen Adobe apps. The other people in the room (virtual or otherwise) are the brain. Regardless of their skill in design, it’s their job to give the hand some constraints to work within.