ACT stands for Acceptance and Commitment Therapy. It is a form of cognitive behavioral therapy (CBT) that focuses on helping individuals develop psychological flexibility and deal with negative thoughts and feelings in a more adaptive way. Here are some important principles and concepts in ACT:

1. Acceptance: ACT emphasizes the importance of accepting one's thoughts and feelings rather than trying to control or suppress them. This means learning to be open to and not fight against negative thoughts and feelings.
   
   
2. Defusion: The therapy aims to help the client distance themselves from their negative thoughts and see them for what they are - just thoughts. This helps reduce the negative impact these thoughts have on one's emotions and behaviors.
   
   
3. Mindfulness: ACT often integrates mindfulness exercises to help the individual be more present in their experiences and pay attention to the present instead of being drawn into worries about the future or regrets about the past.
   
   
4. Values and Commitment: In ACT, the client is encouraged to identify their personal values and goals in life. The therapy then helps the client take concrete steps towards living in accordance with these values, despite any negatively charged thoughts and feelings.
   
   
5. Action (Behaviour): ACT focuses on developing action plans and encourages the client to take active steps towards their goals, even if there are obstacles and fears.
   
   
6. Psychological flexibility: The overall goal of ACT is to increase psychological flexibility, which means being open to experiences, choosing behaviors in accordance with values and goals and not getting stuck in negative thought patterns.
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ACT has been shown to be effective for a range of conditions such as anxiety, worry, depression and stress. It is a therapy method that helps individuals build a better relationship with their thoughts and feelings, and to live a meaningful life in line with their values and goals.