Ideation techniques, which in this context is the same as brainstorming techniques, are generally used when you need to generate ideas, get stuck for ideas, cannot seem to move forward, etc. A vast variety of brainstorming techniques exists - try an internet search and see for yourself! Or have a look at the presentation "Ideation techniques"
Why did you choose the brainstorming technique(s) you did?
Ask yourselves what happened when you applied the chosen brainstorming technique(s). What in the process made the difference? Did it work at all and why not?
How did you experience the group dynamics during the brainstorming process? Do your fellow group members agree on your experience?