Intro language

docs/index.md

@@ -1,6 +1,6 @@
 ## Status
 
-Early proposal drafted with input from technology and lab vendors
+Draft implementation guide authored with input from technology and lab vendors; created in conjunction with four independent software implementations.
 
 ## Contributing
 To propose changes, please use GitHub [Issues](https://github.com/smart-on-fhir/health-cards/issues) or create a [Pull Request](https://github.com/smart-on-fhir/health-cards/pulls).
@@ -10,7 +10,7 @@ To propose changes, please use GitHub [Issues](https://github.com/smart-on-fhir/
 
 # Introduction -- Health Cards
 
-In this proposal we focus on enabling "Health Cards", with a short term goal to enable a consumer to receive COVID-19 serology or PCR results from a participating lab and **present these results to another party in a verifiable manner**. Key use cases include conveying point-in-time infection status for return-to-workplace and travel. This approach should also support documentation of immunization status and other health details.
+This implementation guide provides a framework for "Health Cards", with a short term goal to enable a consumer to receive COVID-19 serology or PCR results from a participating lab and **present these results to another party in a verifiable manner**. Key use cases include conveying point-in-time infection status for return-to-workplace and travel. This approach should also support documentation of immunization status and other health details.
 
 Because we must ensure end-user privacy and because Health Cards must work across organizational and jurisdictional boundaries, we are building on international open standards and decentralized infrastructure. 
 
@@ -18,6 +18,7 @@ Because we must ensure end-user privacy and because Health Cards must work acros
 ## Conceptual Model
 
 ![Figure](https://i.imgur.com/T8RHjlJ.png)
+
 * **Issuer** (e.g., a lab) generates verifiable credentials 
 * **Holder** stores credentials and presents them at will
 * **Verifier** receives credentials from holder and ensures they are properly signed