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Related Concept Videos

Experimental Designs01:16

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An experimental design is a systematic process that allows researchers to evaluate the relationship between dependent and independent variables. There are three widely used types of experimental design - pre-experimental design, true experimental design, and quasi-experimental design. In pre-experimental design, the researcher compares the data before and after some interventions or treatments. The true-experimental design has more than one purposefully created group, a commonly measured...
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Body:Bioequivalence experimental study designs play a pivotal role in testing the effectiveness of various treatments. Key among these are the repeated measures, cross-over, carry-over, and Latin square designs. In the repeated measures design, each subject receives all treatments, allowing for temporal comparisons. This type of design is useful in reducing variability but requires careful planning to avoid bias.The cross-over design, an economical method, involves sequential administration of...
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A Within-Subject Experimental Design using an Object Location Task in Rats
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Experimental and quasi-experimental designs in implementation research.

Christopher J Miller1, Shawna N Smith2, Marianne Pugatch3

  • 1VA Boston Healthcare System, Center for Healthcare Organization and Implementation Research (CHOIR), United States Department of Veterans Affairs, Boston, MA, USA; Department of Psychiatry, Harvard Medical School, Boston, MA, USA.

Psychiatry Research
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Summary

Implementation science uses experimental and quasi-experimental designs to improve the adoption and sustainability of clinical practices. This guide helps researchers choose the best study design for real-world effectiveness.

Keywords:
ImplementationInterrupted time seriesPre-post with non-equivalent control groupQuasi-experimentalSMART designStepped wedge

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Area of Science:

  • Implementation Science
  • Clinical Research Methodology
  • Health Services Research

Background:

  • Implementation science aims to integrate effective clinical practices into routine care.
  • Randomized controlled trials (RCTs) are often suitable, but differ from traditional efficacy trials.
  • Quasi-experimental designs are valuable when randomization is not feasible.

Purpose of the Study:

  • To review experimental and quasi-experimental designs for implementation science.
  • To provide a practical guide for selecting appropriate study designs.
  • To enhance the adoption, spread, and sustainability of effective clinical practices.

Main Methods:

  • Review of experimental designs, including implementation-focused randomized controlled trials (RCTs).
  • Review of quasi-experimental designs: pre-post with non-equivalent control group, interrupted time series (ITS), and stepped-wedge designs.
  • Discussion of the strengths and weaknesses of various study designs.

Main Results:

  • Experimental designs, particularly RCTs, can address many implementation questions.
  • Quasi-experimental designs offer alternatives when randomization is not possible.
  • Methodological advances are improving implementation study designs.

Conclusions:

  • Selecting the appropriate study design is crucial for answering implementation science questions.
  • Effective use of experimental and quasi-experimental designs can accelerate the uptake of evidence-based practices.
  • This review guides researchers in optimizing study design for real-world clinical impact.