Visual thinking helps to make things clear. It's really important to see all options clearly when it comes time to make a decision. A matrix is a great (and easy) way to make it clear how your options stack up.
To use, write the names of four books at the top (by each of the four books!). Write your criteria in the boxes on the left. For example, "Is the topic interesting to me?" "Do I understand most of the words?" Use a happy or sad face to answer each question about each of the four books. Then it's easy to see the book that best meets the criteria - it has the most happy faces.
This evaluation matrix was created for use in elementary classrooms but can easily be adapted for adult use.