diff --git a/doc/src/test/java/com/mastercard/test/flow/doc/ModuleDiagramTest.java b/doc/src/test/java/com/mastercard/test/flow/doc/ModuleDiagramTest.java
index 25b4cf0d50..4cc4c0a88c 100644
--- a/doc/src/test/java/com/mastercard/test/flow/doc/ModuleDiagramTest.java
+++ b/doc/src/test/java/com/mastercard/test/flow/doc/ModuleDiagramTest.java
@@ -34,10 +34,20 @@ class ModuleDiagramTest {
 			"com.mastercard.test.flow:aggregator",
 			"com.mastercard.test.flow:doc" ).collect( toSet() );
 
+	/**
+	 * Maps from the groupID to the scope of links that we're interested in within
+	 * that group.
+	 */
 	private static final Map<String, Set<String>> SCOPES;
 	static {
 		Map<String, Set<String>> m = new HashMap<>();
+		// For the framework we want to show *what* will be included transitively if you
+		// consume an artifact. We've got some test-scope dependencies in here to
+		// avoid excessive mocking, but they just cloud the diagram.
 		m.put( "com.mastercard.test.flow", Stream.of( "compile" ).collect( toSet() ) );
+		// For the example service it's important to show *how* the framework
+		// dependencies are consumed - e.g. assert and validation are always test scope,
+		// the model doesn't make it into the distributable artifacts, etc
 		m.put( "com.mastercard.test.flow.example", Stream.of( "compile", "test" ).collect( toSet() ) );
 		SCOPES = Collections.unmodifiableMap( m );
 	}
@@ -133,8 +143,6 @@ protected Link( String fromGroup, String fromArtifact, String type, String toGro
 			this.type = type;
 			this.toGroup = toGroup;
 			this.toArtifact = toArtifact;
-
-			System.out.println( this + " " + intraGroup() );
 		}
 
 		public boolean intraGroup() {
diff --git a/validation/validation-core/src/main/java/com/mastercard/test/flow/validation/check/ModelTaggingCheck.java b/validation/validation-core/src/main/java/com/mastercard/test/flow/validation/check/ModelTaggingCheck.java
index f06c2b3e4a..fd1c09de39 100644
--- a/validation/validation-core/src/main/java/com/mastercard/test/flow/validation/check/ModelTaggingCheck.java
+++ b/validation/validation-core/src/main/java/com/mastercard/test/flow/validation/check/ModelTaggingCheck.java
@@ -71,8 +71,8 @@ private List<Check> buildChecks( Model model, List<Check> checks ) {
 					.collect( Collectors.toCollection( TreeSet::new ) );
 			modelUnionTags.removeAll( modelIntersectionTags );
 
-			String expected = formatCopypasta( modelUnionTags, modelIntersectionTags );
-			String actual = formatCopypasta( flowUnionTags, flowIntersectionTags );
+			String expected = formatCopypasta( flowUnionTags, flowIntersectionTags );
+			String actual = formatCopypasta( modelUnionTags, modelIntersectionTags );
 
 			if( !expected.equals( actual ) ) {
 				return new Violation( this, "Inaccurate tagging", expected, actual );
@@ -97,9 +97,8 @@ private static String formatCopypasta( Set<String> union, Set<String> intersecti
 			sb.append( ")\n         .union(" );
 			sb.append( union.stream()
 					.collect( joining( QUOTE_COMMA_QUOTE, QUOTE, QUOTE ) ) );
-			sb.append( ")" );
 		}
-		sb.append( ";" );
+		sb.append( ");" );
 		return sb.toString();
 	}
 
diff --git a/validation/validation-core/src/test/java/com/mastercard/test/flow/validation/check/ModelTaggingCheckTest.java b/validation/validation-core/src/test/java/com/mastercard/test/flow/validation/check/ModelTaggingCheckTest.java
index 9bf75e15d8..56d8f00090 100644
--- a/validation/validation-core/src/test/java/com/mastercard/test/flow/validation/check/ModelTaggingCheckTest.java
+++ b/validation/validation-core/src/test/java/com/mastercard/test/flow/validation/check/ModelTaggingCheckTest.java
@@ -61,14 +61,30 @@ void accurate() {
 	 */
 	@Test
 	void violation() {
-		test( leaf( "leaf",
+		test( leaf( "empty model tags",
+				new TaggedGroup(),
+				"a,b,c" ),
+				"  details: Inaccurate tagging\n"
+						+ " expected: new TaggedGroup(\"a\", \"b\", \"c\");\n"
+						+ "   actual: new TaggedGroup();\n"
+						+ "offenders: " );
+
+		test( leaf( "empty flow tags",
+				new TaggedGroup( "a", "b", "c" ).union( "d" ) ),
+				"  details: Inaccurate tagging\n"
+						+ " expected: new TaggedGroup();\n"
+						+ "   actual: new TaggedGroup(\"a\", \"b\", \"c\")\n"
+						+ "         .union(\"d\");\n"
+						+ "offenders: " );
+
+		test( leaf( "mismatch",
 				new TaggedGroup( "a", "b", "c" ).union( "d" ),
 				"a,b,c", "b,c,d" ),
 				"  details: Inaccurate tagging\n"
-						+ " expected: new TaggedGroup(\"a\", \"b\", \"c\")\n"
-						+ "         .union(\"d\");\n"
-						+ "   actual: new TaggedGroup(\"b\", \"c\")\n"
+						+ " expected: new TaggedGroup(\"b\", \"c\")\n"
 						+ "         .union(\"a\", \"d\");\n"
+						+ "   actual: new TaggedGroup(\"a\", \"b\", \"c\")\n"
+						+ "         .union(\"d\");\n"
 						+ "offenders: " );
 	}
 
@@ -83,14 +99,14 @@ void recursiveViolation() {
 				leaf( "right", new TaggedGroup( "b", "c" ), "b,c,d" ) ),
 				"left : pass",
 				"  details: Inaccurate tagging\n"
-						+ " expected: new TaggedGroup(\"b\", \"c\";\n"
-						+ "   actual: new TaggedGroup(\"b\", \"c\", \"d\";\n"
+						+ " expected: new TaggedGroup(\"b\", \"c\", \"d\");\n"
+						+ "   actual: new TaggedGroup(\"b\", \"c\");\n"
 						+ "offenders: ",
 				"  details: Inaccurate tagging\n"
 						+ " expected: new TaggedGroup(\"b\")\n"
-						+ "         .union(\"a\", \"c\", \"x\");\n"
-						+ "   actual: new TaggedGroup(\"b\")\n"
 						+ "         .union(\"a\", \"c\", \"d\");\n"
+						+ "   actual: new TaggedGroup(\"b\")\n"
+						+ "         .union(\"a\", \"c\", \"x\");\n"
 						+ "offenders: " );
 	}