This collection of papers considers processes involved in language change and issues of how they can be modeled and studied. After "Introduction" (Raymond Hickey), there are 15 papers in 6 parts. Part 1, "The Phenomenon of Language Change," includes: (1) "On Change in 'E-language'" (Peter Matthews); and (2) "Formal and Functional Motivation for Language Change" (Frederick J. Newmeyer). Part 2, "Linguistic Models and Language Change," includes: (3) "Metaphors, Models and Language Change" (Jean Aitchison); (4) "Log(ist)ic and Simplistic S-Curves" (David Denison); (5) "Regular Suppletion" (Richard Hogg); and (6) "On Not Explaining Language Change: Optimality Theory and the Great Vowel Shift" (April McMahon). Part 3, "Grammaticalisation," includes: (7) Grammaticalisation: Cause or Effect?" (David Lightfoot); and (8) "From Subjectification to Intersubjectification" (Elizabeth Closs Traugott). Part 4, "The Social Context for Language Change," includes (9) "On the Role of the Speaker in Language Change" (James Milroy). Part 5, "Contact-Based Explanations," includes: (10) "The Quest for the Most 'Parsimonious' Explanations: Endogeny vs. Contact Revisited" (Markku Filppula); (11) "Diagnosing Prehistoric Language Contact" (Malcolm Ross); (12) "The Ingenerate Motivation of Sound Change" (Gregory K. Iverson and Joseph C. Salmons); and (13) "How Do Dialects Get the Features They Have? On the Process of New Dialect Formation" (Raymond Hickey). Part 6, "The Typological Perspective," includes: (14) "Reconstruction, Typology and Reality" (Bernard Comrie); and (15) "Reanalysis and Typological Change" (Raymond Hickey). (Papers contain references.) (SM)