ABSTRACT
 
ACKNOWLEDGMENTS
 
LIST OF TABLES
 
LIST OF FIGURES
 
LIST OF SYMBOLS FOR TRANSCRIPTION
 
  CHAPTER 1. INTRODUCTION

•  Introduction
   Statement of the Problem
   Research Questions
   The Theoretical Link
   Implications
   Applications

  CHAPTER 2. LITERATURE REVIEW

• Introduction
  Input, Interaction, and SLA
  • The Input and Interaction Hypotheses
    The Relationship Between Input and Comprehension
    • Studies Describing Input Modifications
      Studies Investigating the Effects of  Input Modifications on Learners' Comprehension
      Summary
    The Relationship Between Interaction and Comprehension
    • Studies Describing Interactional Modifications
      Studies Investigating the Effects of  Interactional Modifications on Learners' Comprehension
      Summary
    The Relationship Between Interaction and Comprehension, and Vocabulary Acquisition
    • Studies Investigating the Effects of  Interaction and Comprehension on Vocabulary Acquisition
      Summary
  The Role of Learner Participation in SLA
  • Participation by Young Learners
    Participation by Learners of  Differing Ages
    Summary
  The Nature of L2 Vocabulary Acquisition and Teaching
  • L2 Vocabulary Acquisition
    • L2 Vocabulary Knowledge Described
      L2 Vocabulary Learning Theory
      L2 Vocabulary Learning Strategy
      Summary
    L2 Vocabulary Teaching
    • L2 Vocabulary Teaching Theory
      L2 Vocabulary Teaching Strategy
      Summary
  Summary Statement

  CHAPTER 3. METHOD

•  Overview of Research Design
   Variables
   Subjects
   Instruments and Procedures
  •  Placement in ESL Classes
     Lexical Proficiency
     Pretests
    •  Content
       Aim
       Administration
     Selection of Lexical Items for Communication Tasks
    •  Round 1
       Round 2
     Treatment
    •  Condition 1
       Condition 2
       Condition 3
     The Communication Tasks
    •  Content
       Aim
       Administration
     Posttests
   Scoring
  •  Interaction
     Comprehension
     Lexical Acquisition
   Reliability of Measures
  •  Interaction
     Comprehension
     Lexical Acquisition
   Analysis
  •  Research Question 1
     Research Question 2
     Research Question 3
     Research Question 4
   Summary

  CHAPTER 4. RESULTS AND DISCUSSION

•  Interaction
   Comprehension
   Lexical Acquisition
   Comparing Interaction, Comprehension, and Lexical Acquisition Across Individual and Group Settings
   Research Question 1
  •  Results
     Discussion
   Research Question 2
  •  Results
     Discussion
   Research Question 3
  •  Results
     Discussion
   Research Question 4
  •  Results
     Discussion

 CHAPTER 5. CONCLUSION

FOOTNOTES

REFERENCES CITED

APPENDIXES

  A.  SUBJECT BACKGROUND INFORMATION
 
  B.  MEASURES OF ENGLISH PROFICIENCY

  C.  LEXICAL ITEMS INCLUDED IN PRETESTS AND POSTTESTS

  D.  DESCRIPTION OF INFORMATION-GAP TASKS

  E.  TRANSCRIPTION OF INFORMATION-GAP TASKS

        Transcription of Task 1A
        Transcription of Task 1B (Group 1)
        Transcription of Task 1B (Group 2)
        Transcription of Task 2A
        Transcription of Task 2B.(Group 1)
        Transcription of Task 2B (Group 2)

  F.  INTERACTION, COMPREHENSION, AND ACQUISITION SCORES ARRANGED BY TASK

  G.  INTERACTION, COMPREHENSION, AND ACQUISITION SCORES FOR EACH SUBJECT ON EACH  NEW LEXICAL ITEM