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Evaluation Design Strategies

This document outlines three types of evaluation designs: non-experimental, quasi-experimental, and experimental. Non-experimental designs track outcomes only for the intervention group with either post-test only or pre- and post-tests. Quasi-experimental designs collect data from intervention and comparison groups that are not randomly assigned. Experimental designs randomly assign participants to intervention and control groups, making them the most credible for measuring program impact. Both quasi- and experimental designs measure groups before and after the intervention.

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Karen Ruste Villaluna-Abulencia
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90 views1 page

Evaluation Design Strategies

This document outlines three types of evaluation designs: non-experimental, quasi-experimental, and experimental. Non-experimental designs track outcomes only for the intervention group with either post-test only or pre- and post-tests. Quasi-experimental designs collect data from intervention and comparison groups that are not randomly assigned. Experimental designs randomly assign participants to intervention and control groups, making them the most credible for measuring program impact. Both quasi- and experimental designs measure groups before and after the intervention.

Uploaded by

Karen Ruste Villaluna-Abulencia
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Outcome/Impact Evaluation Designs

A, Non-Experimental Design
• Outcomes only tracked for intervention group (those that received the service)
Pre-test Treatment Post-test

Single Group - post-test only X 0

Single Group - pre- and posttest 0 X 0

X = intervention is administered 0 = measurement is taken



B. Quasi Experimental Design
• Collect data on two+ study groups (intervention group and comparison group)
• Intervention and comparison groups:
o identified from pre-existing or self-selected groups
o not formed through a random assignment process
• NOTE: Pre-existing differences between the intervention and comparison groups at the outset
of the intervention may lead to inaccurate estimates of the program’s effects.
Pre-test Treatment Post-test

Intervention Group 0 X 0

Comparison Group 0 0

X = intervention is administered 0 = measurement is taken

C. Experimental Design
• Collect data on two+ study groups (intervention group and comparison group)
• Random assignment techniques (e.g., lottery draw) are used by the evaluator to assign study
participants to either the intervention or the control group.
• NOTE: Random assignment ensures study groups are equivalent PRIOR to intervention.
Considered most credible design for producing evidence of program impact.

Pre-test Treatment Post-test

Intervention Group - Randomly assigned 0 X 0

Control Group - Randomly assigned 0 0

X = intervention is administered 0 = measurement is taken

2/2017 Adapted from CNCS Evaluation Core Curriculum by Susan Hyatt, Big Purpose Big Impact

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