I’m a enthusiast of 4-colour pens. Here is my technique: black is for all primary notes; blue is for organizing Key notes, taking secondary notes, and building revisions; purple is for all names and get in touch with information; environmentally friendly is for all to-dos and follow-ups. Dan, Brisbane https://lukasjrovl.blogocial.com/the-2-minute-rule-for-hbs-case-solution-69463366