Don, I measure my progress in various ways. At one time, I could not walk 10 feet without having to sit down and catch my breath. Now, I walk indefinitely. I used to end up in the hospital with exacerbations at least once a yr. I have not been in a hospital or ER since 2016. I have not had a cold or flu in yrs except for the flu shot last yr made me sick as a dog. More and more energy is coming back to me now. My normal oxygen level used to be 90, now, it is 97. So, to answer your question on measuring progress, mine are measured in improvements.