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This text aims to convey some of the interest and charm of modal logic, and to put a reader new to the subject in a position to have an informed opinion as to its applicability to each of several areas of philosophical concern (belief, knowledge, obligation ...) in which the merits of a `modal approach have been controversial.

he main focus, for these purposes, is on normal modal logics, though some attention is given to the non-normal side of the picture.