diff --git a/shacl12-ui/index.html b/shacl12-ui/index.html
index 430e6684..1fa50466 100644
--- a/shacl12-ui/index.html
+++ b/shacl12-ui/index.html
@@ -187,15 +187,42 @@ <h2>Document Outline</h2>
       <p>Content.</p>
     </section>
 
-    <section id="introduction">
+    <section id="introduction" class="appendix informative">
       <h2>Introduction</h2>
-      <p>Content.</p>
+      <p>
+        RDF applications commonly provide user interfaces that allow users to view and edit RDF resources.
+        SHACL Core, together with vocabularies such as DASH, has often been used for this purpose by
+        describing the structure, constraints, labels, and presentation-relevant metadata associated with
+        RDF data.
+      </p>
+
+      <p>
+        SHACL User Interfaces are defined by this specification as a complementary vocabulary and rendering model for
+        generating forms from SHACL shapes. It introduces UI-specific concepts and processing rules for
+        determining widgets, resolving labels, and grouping and ordering the form components used to manage
+        RDF resources.
+      </p>
+
+      <p>
+        Existing SHACL shapes and RDF data can be used to generate functional forms without additional
+        SHACL UI annotations. SHACL UI annotations allow authors to provide more specific rendering
+        information, enabling implementations to generate more tailored and consistent forms.
+        The goal is to improve interoperability between SHACL-based form generation systems
+        by defining common behavior across implementations.
+      </p>
+
+      <p>
+        This specification is intended for RDF application developers, RDF data editors, and authors of SHACL
+        shapes who wish to generate forms for their data.
+      </p>
 
       <section id="scope" class="appendix informative">
         <h3>Scope</h3>
-        <p>This specification defines form generation using SHACL Core for viewing and editing RDF resources. 
-          Its scope is limited to the rendering of forms from SHACL Core concepts such as shapes, constraints, and property paths. 
-          It also defines label and language resolution for RDF resources and their predicates, as well as a mechanism for determining the widgets used to render value nodes.
+        <p>
+          The scope of this specification is limited to form rendering for viewing and editing RDF resources
+          using SHACL Core concepts such as shapes, constraints, and property paths. It defines processing
+          behavior for label and language resolution, field grouping and ordering, and widget determination
+          for value nodes.
         </p>
 
         <p>