A complete personal knowledge management (PKM) guide. Learn how to build a knowledge management system and gather information effectively. When we're on the subject of note-taking, many of history's greatest minds took detailed notes of the intellectual pursuits.The origins of modern knowledge management software zettlekasten may be traced to inventor Vannevar Bush. In a 1945 article “As We May Think” Bush conceptualized a device called “Memex” effective at storing books, records, and other information. And it couldn't become more relevant when discussed in the context of knowledge management. By consciously managing personal knowledge, you're effectively prepping yourself for professional and personal challenges coming your way.