The introduction states:  (highlighted by me)

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Social Determinants of Health (SDOH) are increasingly being recognized as essential factors that influence healthcare outcomes. This HL7 Implementation Guide (IG) defines *how to exchange SDOH content defined by the Gravity Project using the Fast Healthcare Ineroperability Resources (FHIR) standard.*

It *defines how to represent coded content used to support the following care activities:*
1. screening
1. clinical assessment/diagnosis
1. goal setting
1. the planning and performing of interventions.

This IG addresses the need to gather SDOH information in the context of clinical encounters and describes how to share SDOH information and other relevant information with outside organizations for the purpose of coordinating services and support to address SDOH related needs.

*In addition, the IG demonstrates how to share clinical data to support secondary purposes such as population health, quality, and research*

The guide supports the following use cases:

1. Document SDOH data in conjunction with the patient encounters Document and track SDOH related interventions to completion
1. Gather and aggregate SDOH data for uses beyond the point of care (e.g. public health, population health, quality measurement, risk adjustment, quality improvement, and research)

This implementation guide was developed under the auspices of the Gravity FHIR
accelerator project, which specifically focuses on using HL7 FHIR to define
standards for the exchange of SDOH-related information. Both the project and
this implementation guide are focused on the U.S. environment.

This implementation guide leverages content from the US Core implementation guide and binds to US-specific terminology. However, the basic constructs and interaction patterns may well be applicable outside the U.S.

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Unfortunately after reading this guide,  I could not identify where these stated purposes and goals were met. As an implementer, I would not be able to implement this guide.   I recommend a complete rewrite.