關於英文語句意思一問~~

Start by studying Chapter 2 of the textbook. It’s full of good
information.

When you come up with an idea for a topic, check it against the summary
checklist in Box 2.2 on page 24 of the textbook. In this way, you can
confirm for yourself if it’s suitable or not.

Your current idea could pass some of the tests, but not all. For
example, there’s no clear link to theory; no obvious insight.


請問以上一句"there’s no clear link to theory"係點解?
thanks~~