Work on relationship & addressing the reasons for the unwillingness.
Prevention is best (starting out positive early on, rather than control-based.) But otherwise it's just a matter of addressing the adversarial dynamic that developed because of that lack of prevention.
Responding to any issue in ways that support the relationship & lead to more connection tends to correct the dynamic that is CAUSING the resistance, CAUSING the lack of cooperation. This is true at any point--earlier in childhood or right smack in the middle of the teen years.
We (humans) all tend to cooperate and contribute willingly when we feel good (in other words, when we feel close, respected, valued, autonomous, and "seen" or understood for who we are & what we intend.) Try to relate & respond (to the opposition) in ways that affirm & strengthen THOSE conditions in the teen -----> feelings of being respected, accurately understood, valued.
at 10:03 AM on Sep. 4, 2013