Based on Chapter 4 of my dissertation, I argue on the basis of the cognitive status of the cleft clause when it co-occurs with cleft pronouns of various forms that the cleft pronoun and the cleft clause form a discontinuous definite description, and that this explains why both nominal definite descriptions and clefts exhibit existential and exhaustiveness presuppositions. The copula identifies this definite description with the clefted constituent, and so the clefted constituent functions as an identificational focus in the sense of É. Kiss (1998). Topic-comment status is overlaid on this identificational focus + presupposition structure, so that clefts can have comment-topic, topic-comment or all comment organization. Information focus in É. Kiss' sense can thus fall on either the clefted constituent or the cleft clause. I review previous generative syntactic analyses of clefts, dividing them into 'extraposition' analyses and 'expletive' analyses, depending upon whether the cleft pronoun is treated as playing some referential role in the cleft sentence. I propose a new extraposition analysis in which the cleft pronoun plays the role of a DP head that discontinuously takes the cleft clause CP as its complement.