"The first edition of this Handbook was published in 2011, and the fields of clinical linguistics and clinical phonetics have developed considerably since that volume was prepared. Partly, this can be seen in the fact that this new edition has four more chapters and an extra Part than the first edition. But, more importantly, the chapters themselves record important advances in their respective areas. We were fortunate that many of the scholars who contributed to the first edition were available to update their chapters. In some cases, however, both for new chapters and where the original author was unavailable, we have recruited new contributors. The editorial team, too, has changed. Two of the original editors were not free to work on the new edition (though are still co-authors of chapters in this collection) but the new team is balanced both in terms of areas of expertise and geographical areas. Part 1 (Pragmatics, Discourse, and Sociolinguistics) has two more chapters in this edition compared to the first. Multimodal analysis of interaction - an area of recent interest in our field - has been added to this Part; also, the important topic of corpus linguistics as applied to clinical corpora is covered. Both these new chapters are authored by leading scholars in their subjects. Of the remaining chapters in Part 1, three have brand new author teams and most of the remainder have strengthened their teams with additional scholars. Part 2 (Syntax and Semantics) has ten chapters, that is, one more than the first edition. The new chapter deals with disruptions to language in the sign modality, a welcome addition to the topics covered in this part of the book. Six of the other chapters have been updated by the authors of the equivalent chapters in the first addition (some with added co-contributors), while three have new authorial teams. The original part 3 (Phonetics and Phonology) has undergone the greatest transformation. In the first edition, chapters dealing mostly with phonology were intermingled with those better classed as phonetics. For this new edition the editors decided to separate the two subject fields, at least partly due to a recognition that phonetics (unlike phonology) falls outwith the discipline of linguistics. Part 3 of this new edition, therefore, contains chapters dealing with a variety of phonological topics. Of the eleven chapters in this part, five are new and cover clinical phonology and the assessment of phonology, phonological development, and cross-linguistic aspects. One chapter from the first edition has been rewritten by a new team, and the remaining five have been updated by the original authors (some with new co-authors). Part 4 (Phonetics) contains ten chapters. A reorganization of topics since the first edition now sees three chapters dealing with instrumental analysis of speech, with the remaining topics similar to those included previously. Two of the three instrumental chapters have new author teams, with the third adding a new co-author. Three of the other chapters also have new authors, with the remaining four being written by the original authors often with new co-authors added. The Editors are proud of the Handbook's diversity, in particular, different clinical contexts, a variety of theoretical frameworks, and a range of scholarly traditions. Further, the contributors are from a number of different countries and work with numerous languages; they are from both clinical and non-clinical backgrounds and include linguists, phoneticians, speech-language pathologists and psychologists. This diversity reflects the multifarious nature of clinical linguistics and communication rehabilitation. We are confident that this updated and expanded Handbook will be a valuable resource for clinicians, phoneticians, and linguists interested in looking at research in all parts of subject, reviewed and presented by the leading scholars of their areas"--