Agree with all points above. In addition, I think that therapy is having a positive impact when I become more resilient to stress and acute life crises, am more aware and proactive in managing triggers and stressors, am better able to identify and utilise learned tools and strategies during difficult times and not only for "practice" during calmer times, am better able to problem solve and have insight into changes to my emotional and psychological state resulting from life issues, am more stable and integrated in my recollection and processing of trauma, am better emotionally regulated...
Ok, I'm straying into pipedream territory, and am in no way suggesting that I'm on top of all of these things, but even by small degrees, these are some of the ways in which I am able to identify positive cumulative effects of therapeutic interventions.
For me, overall progress is measured both in relation to my management and processing of past traumas, and my management and coping with daily life and the demands of being human, such as stress, relationships, emotional regulation and lifestyle.
Pity that none of these variables are quantifiably measureable...
Maddog