In this paper two ways of
generalizing compactness are studied. We may consider various types of
refinements of open covers, such as countable open refinements, locally finite open
refinements, etc. In another direction, countably compact spaces may be
characterized as having the property that any sequence has a cluster point. Spaces
which require that certain sequences have cluster points, such as Σ-spaces,
wΔ-spaces, and q-spaces, will be referred to as generalized countably compact
spaces.