Which of the five (5) innovation skills –questioning, observing, networking, experimenting, associative thinking –do you consider as most important?

Which of the five (5) innovation skills –questioning, observing, networking, experimenting, associative thinking –do you consider as most important? Why? How can you as an OD practitioner help the team, in general, to be more innovative?

Please reference chapter 16 from textbook listed below.
Practicing Organizational Development (4th Edition)
Author: Rothwell