with tools from your own kitchen
Chief Architect @ Meniga Rewards
https://github.com/amzn/computer-vision-basics-in-microsoft-excel
You don't know excel - Joel Spolsky
https://www.youtube.com/watch?v=0nbkaYsR94c
Saving the world from spreadsheets
https://www.youtube.com/watch?v=GyWKxFxyyrQ
http://www.peri.umass.edu/fileadmin/pdf/working_papers/working_papers_301-350/WP322.pdf
Keep a directory of definitions
Who is a customer?
When do they churn?