For each of the 2 techniques (user observation, think-aloud):

1) What kinds of information and insights did it give you about the usability of the prototype?

user observation is helping me to find out whether test user having any difficulties of using the product, the focus is on the test user while think-aloud is to encourage myself to think of how well the user interface is designed, I can do think-aloud activities without other people’s help.

2)What aspects of the technique worked well or were frustrating?

Think-aloud is kind of weird when the people generally doesn’t talk and if we make them keep talking which will distract him from focusing on the task, user observation is highly related to culture background when gestures could mean differently which is more difficult for the observer to capture the meaning.