Ok! I am ready to start a treatment evaluation. It would be great if anyone could give me some very practical tips! Or some steps to follow!

No worries!

Oh, I see. Thanks!

From guidelines from the Centers for Disease Control and the World Health Organization Workbooks 1 and 2, these are the main steps you need to take to design and implement a systematic program evaluation:
1. Engage people affected by the program or evaluation (stakeholders)
2. Decide who will be involved in the evaluation team
3. Describe the program that will be evaluated and develop a visual representation of the program
4. Identify the evaluation needs and assess your evaluation resources
5. Determine your evaluation design: define your evaluation questions and determine your measures and methodology
6. Gather credible evidence
7. Justify conclusions
8. Ensure use of the evaluation and share lessons learned

Also, keep in mind the evaluation process is dynamic and changeable and adapted throughout the process to fit the priorities and gather the necessary evidence.