Single Case Designs Are Both Criticized and Lauded as a Method

Single case designs are both criticized and lauded as a method for showing effectiveness. How have researchers improved on their limitations to make them more valid?

A) They use data obtained from in-depth interviews.
B) They randomly assign treatment strategies to measure their effects on the client case.
C) They measure formal elements in the client's artwork and compare them against art obtained from a control group.
D) They specify the intervention and take repeated measures or assessments.

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