I. INTRODUCTION
    
Network Spinal Analysis™ (NSA) is an evolving discipline of wellness and education concerning one's somatic awareness. Aside from its unique characteristics, herein described, NSA also employs concepts derived from a variety of health professions and theoretical sciences. Thus, currently it is a specific discipline that promotes the body to engage in new spinal and nervous system adaptive strategies with concurrent development of somatic awareness.

As part of the evolution of NSA, the application of Network Care which developed from Network Chiropractic began in 1994. This document includes the early underpinning of that evolution leading from the Epstein Model of Vertebral Subluxation to the Epstein Model of Spinal and Neural Integrity. Each of these eras of development of NSA are presented in this document. This has been done to provide insight for the reader, regarding the continuous efforts through research and human observations, to understand the health and wellness implications and ramifications derived from unique contibution to human advancement. NSA developed from a clinical perspective of detecting, classifying, and reducing the condition of vertebral subluxation. It is now viewed as a method promoting new levels of somatic awareness and self-organizing adaptive strategies. It is not a method that seeks to remedy any dysfunctional condition or return a person to a previous state of health.

Early Development of NSA
Developed by Dr. Donald Epstein in 1994, NSA is a progression of the Network Phasing System, clinical observations, and studies regarding the vertebral subluxation and its association with spinal and neural integrity. Since its inception in 1983, NSA encompassed a comprehensive Model of Vertebral Subluxation, incorporating efficacious methods for its identification and correction. This has included organization of the Levels of Care into a Phasing System (1986) and the addition of three Levels of Care (1995). A fourth Level of Care was added in 2001.

Current clinical observations and formal research suggests that NSA is best characterized as a progression of the Network Phasing System with outcomes regarding (a) enhanced self-awareness of one's soma, spine, and respiration; (b) adaptive self-regulation of adverse spinal cord tension patterns; (c) enhancement of spinal and neural integrity; and (d) the development of specific emerging properties of the spine and nervous system related to improved wellness and quality of life.

The application of NSA was initially directed toward the correction of two classes of vertebral subluxation, which is described in this document as the Epstein Model of Vertebral Subluxation. Although the application of NSA has now evolved beyond that objective, the Epstein Model is presented, herein, as it has served as a pivotal concept for the divergence of NSA from being limited to subluxation correction to a broader concept

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