Mental steps doctrine = Old idea that invention about human interpretation or decision making is not patentable because such “invention” takes place in your mind. Too abstract.
a.    Maybe invention was incomplete. Inventor hasn’t told us in detail how it is the human does that, what they should weigh during the process.
b.    People tried to tie invention to something physical. With software, people said I can tie software to a computer to get around mental steps doctrine.
- Problem: Adding a computer doesn’t seem to add anything meaningful to invention.