Which Are Characteristics of Quasi-Experimental Research Designs That Are Considered $\bold{weaknesses}$

Which are characteristics of quasi-experimental research designs that are considered $\bold{weaknesses}$ , compared with experimental designs? (Select all that apply.)

A) Cost of implementation
B) Confidence in making causal assertions
C) Subject to contamination of internal validity
D) Disruptive to the usual routine of the setting
E) Difficult to perform in a particular clinical setting
F) Findings due to interference of extraneous variables

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