People possess limited mental resources.
Attention bears 1 thing at a time. Short-term memory holds about 7 (simple) things. Motivation and willpower depletes.rR1rA2
- 1 new idea at a time
- 2 decision points
- 3 or 4 full ideas
- Short term attention size
- Time is another resource we decide how to spend. Efficient use.
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↩      Sönke Ahrens, How to Take Smart Notes: One Simple Technique to Boost Writing, Learning and Thinking: For Students, Academics and Nonfiction Book Writers (North Charleston, SC: CreateSpace, 2017). (See notes.) 
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↩      David Rock, Your Brain at Work: Strategies for Overcoming Distraction, Regaining Focus, and Working Smarter All Day Long, 1st ed (New York: Harper Business, 2009). (See notes.)