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Updated: Mar 15, 2026

Qualitative and Quantitative Validation of Tools with Rating Scales Aimed at Assessing the Quality of University Service-Learning

Qualitative and Quantitative Validation of Tools with Rating Scales Aimed at Assessing the Quality of University Service-Learning

Published on: August 29, 2025

External Validity: The Next Step for Systematic Reviews?

Sarah A Avellar¹, Jaime Thomas², Rebecca Kleinman¹

¹1 Mathematica Policy Research, Washington, DC, USA.

Evaluation Review

|September 2, 2016

Summary

This summary is machine-generated.

Systematic reviews often neglect external validity, hindering generalizability. Improved reporting guidelines are needed to ensure key information on intervention applicability across diverse settings is consistently included.

Keywords:

external validity systematic reviews

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Comparing Bibliometric Analysis Using PubMed, Scopus, and Web of Science Databases

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Comparing Bibliometric Analysis Using PubMed, Scopus, and Web of Science Databases

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Published on: October 24, 2019

Area of Science:

Health Services Research
Evidence Synthesis

Background:

Systematic reviews typically assess intervention effectiveness and internal validity.
They often overlook external validity, which concerns applicability in different circumstances.

Purpose of the Study:

To examine how systematic reviews address external validity.
To identify limitations in current reporting of generalizability.

Main Methods:

A brief scan of 19 systematic reviews was conducted.
A detailed analysis of a home visiting research systematic review was performed.

Main Results:

Reviews often lack generalizability data (e.g., statistical representativeness).
Reporting inconsistencies in variables and measurements complicate cross-study comparisons and determinations of sample characteristics.

Conclusions:

Systematic reviews should incorporate external validity more consistently.
Developing reporting guidelines for external validity is crucial for evaluation research and reviews.