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.
In the middle of the 2000s, the designers at creative consultancy Landor installed Adobe Photoshop on their computers and started using it. General manager Antonio Marazza tells author David Sax:
“Overnight, the quality of their designs seemed to decline. After a few months of this, Landor’s Milan office gave all their designers Moleskine notebooks, and banned the use of Photoshop during the first week’s work on a project. The idea was to let their initial ideas freely blossom on paper, without the inherent bias of the software, before transferring them to the computer later for fine-tuning. It was so successful, this policy remains in place today.”