In Chapter 16 of The Giver, how has Jonas changed since he was an eleven?

Great question! What is key to think about is that in this
chapter the Giver gives Jonas his favourite memory, which is of Christmas and a family together.
The overwhelming impression Jonas has of this memory is warmth and love - two emotions that are
absent from the life of the community. This encourages Jonas to begin to think about the
differences between life "back then" in our time, and his life now in his community, and he
begins to see that there are some things that he feels should be
changed.

This change in Jonas is demonstrated most clearly when he
lies to his parents for the first time ever, after he asks them if they "love" him. At the end of
the Chapter, Jonas talks to Gabriel, and makes clear his ideas for
change:

"Things could
change, Gabe," Jonas went on. "Things could be different. I don't know how, but there must be
some way for things to be different. There could be colours.

"And
grandparents," he added, staring through the dimness towards the ceiling of his sleeping room.
"And everybody would have the
memories."

Thus Jonas has changed
greatly since he was given his particular assignment - he has experienced memories which have
helped him to identify some of the shortcomings of their way of life now. He has started to
desire change.