A joint assessment is a structured information for rapid or full/comprehensive HTAs which is the output of joint production in which 2 or more countries and/or organisations work together to prepare shared products or agreed outcomes (Based on definitions from the HTA Network Strategy (page 24) and the EUnetHTA Recommendations (page 6, footnote 8))
Methodological guideline for REA of pharmaceuticals: Internal validity
JA-WP5 EUnetHTA Joint Action (2010-12)
2013 - PDF
This guideline focuses on the assessment of the risk of bias of randomized controlled trials (RCTs), the most relevant trials for relative effectiveness assessment (REA) of pharmaceuticals. The quality assessment of non-randomized and diagnostic accuracy studies will be elaborated in separate guidelines. Likewise, a separate guideline deals with the problem of assessing applicability.
Internal validity describes the extent to which the (treatment) difference observed in a trial (or a meta-analysis) is likely to reflect the ‘true’ effect within the trial (or in the trial population) by considering methodological quality criteria. Because the ‘truth’ can never be assessed, it is more appropriate to speak of the potential for or risk of bias.
Please find the guideline on internal validity at the bottom of this page