  We discuss the Oosterhoff classification of the unusual, metal-rich globular
clusters NGC 6388 and NGC 6441, on the basis of new evolutionary models
computed for a range of metallicities. Our results confirm the difficulty in
unambiguously classifying these clusters into either Oosterhoff group, and also
question the view that RR Lyrae stars in Oosterhoff type II globular clusters
can all be evolved from a position on the blue zero-age horizontal branch.
