Matrix is a nonprofit organization, established in 1984 to help those struggling with addiction. The Matrix Model has been validated in numerous clinical trials, shown to be more effective than traditional drug treatment. The most effective treatment for addiction is based on the length of time in treatment, with no differences between inpatient and outpatient in clinical studies. The Matrix program is flexible, allowing clients to continue work or school while receiving treatment. The most effective treatment for addiction is based on the length of time in treatment, with no differences between inpatient and outpatient in clinical studies. The Matrix program is flexible, allowing clients to continue work or school while receiving treatment.