Intervention

noun

1. The act or process of intervening.

   "a nation's military interventions in neighboring countries; a politician opposed to government intervention in the market economy."

3. The systematic process of assessment and planning employed to remediate or prevent a social, educational, or developmental problem.

   "early intervention for at-risk toddlers."

4. An act that alters the course of a disease, injury, or condition by initiating a treatment or performing a procedure or surgery.
5. A planned, often unannounced meeting with a person with a serious personal problem, such as addiction, in order to persuade the person to seek treatment.