Abstract 1. Introduction 2. Previous Accounts 3. NLBI as one of the 'Headless Reduced Constructions' 3.1. Two Types of Underlying Forms of NLBI 3.2. Evidence form other 'Headless Reduced Constructions' 4. NLBI, Topical Progression, and Addresser's Intention 4.1. Topical Progression 4.2. Topical Progression vs. Discourse Familarity 4.3. NLBI and Addresser's Intention 5. Conclusions and Implications References