How researchers feel about single-case experiments appears to stem, in part, from their personal areas of expertise. Single-case experimental designs lend themselves well to certain areas of investigation, whereas they are difficult, if not impossible, to implement in other areas.
What do you see as some topics in behavioral science for which single-case designs might be most useful?
What are some topics for which such designs would be difficult or impossible to use, and why? Are there topics for which group and single-case designs would be equally appropriate?