“The more you know, the less you carry.” – Mors Kochanski, wilderness survival expert.
Writing and sketching. Card-sorting. Diagrams. Interviews. Spreadsheets. Workshops (guided ideation and synthesis). That’s my toolkit, more or less, for most design problems.
The further I get into my career the more affinity I have for simple and sturdy intellectual tools that can be applied to any number of situations. Give a skilled survivalist a knife, good shoes, and a bit of rope, and they’ll be just fine.