On reviewing the observational literature of the recent past on RRs (or dwarf Cepheid or AI Velorum) and δ Scuti stars, it appeared that most present controversy is centered on three specific questions:
(1) Are δ Scuti stars really periodic, or only quasi-periodic?
(2) Are tidal modulations responsible for the slow cyclic variations observed in many of these stars, or not?
(3) Are there any real physical differences between the members of these two groups, or are they actually the same kind of object?
I would like to restrict this review primarily to these questions; and since some of our recent observational results bear directly on questions CI) and (2), and indirectly on question (3), I hope I will be forgiven for describing briefly here some of our current relevant findings.