Hi, friend! Many thanks for your kind explanation, I get to understand outcome evaluations measure how clients and their circumstances change following participation in treatment and/or rehabilitation. However, I am still confused about how to evaluate the outcomes of a treatment program. Is anyone could give me a hand?

Glad to hear.

Oh, I see. Many thanks!

The basic questions that often could be answered through a treatment evaluation are:
• How effective are these treatment and rehabilitation services?
• How can their effectiveness be assessed?

In other words, outcome evaluations aim to assess treatment effectiveness by seeking to find out, among other things:
• If the clients’ quality of life improved following treatment,
• If there had been a reduction in the quantity/frequency of substance abuse following treatment, and
• Whether clients’ improvement could indeed be attributed to their participation in the particular treatment/rehabilitation program.