What are the differences between pre-experimental evaluation design and quasi-experimental design?

Welcome and cheers.

Thank you for your prompt response.

Pre-experimental evaluation design and quasi-experimental design differ in several aspects:
1. Control groups: Pre-experimental designs typically lack control groups, while quasi-experimental designs incorporate comparison groups to provide a basis for comparison.
2. Randomization: Pre-experimental designs do not involve random assignment of participants, whereas quasi-experimental designs may include some form of non-random assignment or matching.
3. Causality: Pre-experimental designs have limited ability to establish causal relationships due to the absence of control groups and randomization. Quasi-experimental designs offer better potential for inferring causality, although they still fall short of true experimental designs.
4. Statistical analysis: Quasi-experimental designs often utilize more sophisticated statistical techniques, such as regression analysis, to account for potential biases and confounders, whereas pre-experimental designs may rely on simpler descriptive statistics.