Early Intervention and the Speech-Language Pathologist: Best Practices in Assessment and Intervention for Infants and Toddlers

First Edition

Corey Herd Cassidy

Details: 397 pages, B&W, Softcover, 7" x 10"

ISBN13: 978-1-63550-660-0

© 2025 | Available

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Early Intervention and the Speech-Language Pathologist addresses the foundations, knowledge, and evidence-based practices in early intervention (EI) and presents the skills and strategies necessary to provide exceptional services to the young children and families who they will be serving as professionals. It is the first textbook dedicated to providing a comprehensive presentation of theory, facts, and application to provide evidence-based best practices in the complex and continually evolving field of EI. The author thoroughly and effectively addresses all services and service delivery practices provided in EI under IDEA Part C, including prevention, screening, evaluation, assessment, team consultation, service coordination, transition planning, and advocacy.

The book includes a set of 10 case studies covering a wide variety of topics that are intended to support in-class engagement and discussion of the material.

Serving as a starting point for students and providers on the path to a position in EI, the book is designed to provide students with information they recognize, can relate to, and will be able to apply immediately as new speech-language pathologists (SLPs) in EI, as well as to provide instructors with material that is accessible, applicable, and offers a direct connection between teaching and practice. Specifically, the content of the textbook will provide current and future SLPs with the knowledge and skills needed to effectively work with children and their families and caregivers. 

The book is also applicable to all early intervention service providers including early intervention/childhood educators, audiologists, service coordinators, OTs, PTs, social workers, as well as families.  

Plural Plus Online Ancillary Materials

For instructors: PowerPoint slides and critical thinking questions for each chapter.

For students: Case studies, learning outcomes, list of web resources, glossary, and bibliography. 




Part I: Foundations, Principles, and Evidence Supporting Early Intervention

Chapter 1. Introduction to Early Intervention and the Role of the Speech-Language Pathologist

Chapter 2. Guiding Principles of Early Intervention

Chapter 3. Evidence-Based Approaches and Practices in Early Intervention

Part II: Early Intervention in Practice

Chapter 4. Considerations for Early Intervention Services in the Natural Environments

Chapter 5. Current Levels of Functioning

Chapter 6. Screening, Evaluation, and Assessment in Early Intervention 

Chapter 7. Eligibility Determination and Development of the Individualized Family Service Plan

Chapter 8. Culturally and Linguistically Responsive Practices in Early Intervention

Chapter 9. Treatment in the Natural Environment

Chapter 10. Best Practices for Assessment and Treatment of Speech Sound Development

Chapter 11. Feeding Assessment and Intervention

Chapter 12. Special Populations

Appendix A. Screening Measures That Include Early Speech, Language, and Communication Milestones
Appendix B.
Authentic and Functional Evaluation and Assessment Instruments in Early Intervention
Appendix C.
Case Studies in Early Intervention

Corey Herd Cassidy

Corey Herd Cassidy, PhD, CCC-SLP, has provided services to young children and their families for more than 26 years as a licensed speech-language pathologist and as a faculty member in higher education for the past two decades. She currently serves as Professor in the Department of Communication Sciences and Disorders at Radford University, with a secondary appointment of Professor in the Department of Health Systems and Implementation Science at the Virginia Tech Carilion School of Medicine. Throughout her career, Dr. Cassidy has served in multiple leadership positions, including Associate Dean of the Waldron College of Health and Human Services, Founding Director of the Center for Interprofessional Education and Practice, and Executive Director of the Academic Success Center. She teaches, supervises, and conducts scholarship in the areas of early intervention, the relationship between music therapy and speech-language pathology with young children and their families, and interprofessional education, collaboration, and leadership across the education, healthcare, human services, and higher education arenas. Dr. Cassidy is passionate about teaching, mentoring students, and sharing her knowledge and experiences with colleagues. She has had the honor of being invited regularly to present workshops at state, national, and international conferences, and is the author of the chapter addressing service delivery in early intervention in the three most recent editions of Plural Publishing’s Professional Issues in Speech-Language Pathology and Audiology. She lives in Radford, Virginia with her husband and two young children.

Learn More

Early Intervention and the Speech-Language Pathologist: Best Practices in Assessment and Intervention for Infants and Toddlers, First Edition comes with access to supplementary student and instructor resources on a PluralPlus companion website.

The companion website is located at:


The student resources include:

  • Case Studies
  • Learning Outcomes
  • List of Web Resources
  • Glossary
  • Bibliography

To access the student resources, you must register on the companion website and log in using the access code located in the front of your textbook.


The instructor resources include PowerPoint Slides and Critical Thinking Questions for each chapter. You will also have access to all of the student resources listed above.

To access the instructor resources, you must contact Plural Publishing, Inc. to be verified as an instructor and receive your access code.

            Email: instructormaterials@pluralpublishing.com

            Tel: 866-758-7251 (toll free) or 858-492-1555

*Note for students: If you have purchased this textbook used or have rented it, your access code will not work if it was already redeemed by the original buyer of the book. Plural Publishing does not offer replacement access codes for used or rented textbooks.

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First Edition

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Details: 489 pages, B&W, Softcover, 7" x 10"

ISBN13: 978-1-59756-985-9

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Fourth Edition

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Details: 411 pages, B&W, Softcover, 7" x 10"

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