Expert opinion's role in assessment.

Area of Science:

• Medical Technology Assessment
• Evidence-Based Medicine

Background:

• Randomized clinical trials (RCTs) are considered the gold standard for scientific evidence.
• However, RCTs are often impractical or impossible to conduct for many medical technologies.

Purpose of the Study:

• To highlight the limitations of RCTs in technology assessment.
• To discuss alternative evidence sources used in the absence of RCTs.

Main Methods:

• Review of common methodologies in technology assessment.
• Analysis of reliance on observational study designs.
• Inclusion of expert opinion and group judgment.

Main Results:

• Observational studies, including prospective cohort, case control, retrospective, and cross-sectional studies, are frequently employed.
• Expert opinion, whether published or from assessors, forms a significant component of the evidence base.
• The practical constraints of RCTs necessitate the use of these alternative methods.

Conclusions:

• Technology assessment must adapt to the limitations of evidence generation.
• A combination of observational data and expert judgment is essential for evaluating technologies when RCTs are not feasible.