Т.е. пациентам предоставляется возможность время от времени заполнять различные анкеты/вопросники и таким образом давать отзывы или оценку происходящему (лечения, обслуживания, оказываемых услуг и т.п.)

Регистрировать информацию о соблюдении режима приема препарата и обеспечивать возможность ее изучения теми, кто проводит исследование (эффективности этого препарата)
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4619779/
Measuring adherence is, therefore, important to both researchers and clinicians. Inaccurate estimation of medication adherence can lead to several problems which are potentially costly and dangerous in both settings. Effective treatments may be judged as ineffective, expensive diagnostic procedures may be ordered, and therapy may be unnecessary and dangerously intensified. In addition, results of clinical trials cannot be realistically interpreted without adherence information [15, 16]: treatment efficacy and dose-response relationships are miscalculated in studies where patients present poor adherence. Moreover, accurate estimates of medication adherence will provide better evidence on the consequences, predictors/risk factors, and strategies to improve medication adherence.