diff --git a/content/modules/ROOT/pages/concepts.adoc b/content/modules/ROOT/pages/concepts.adoc
new file mode 100644
index 0000000000000000000000000000000000000000..4a8fbdd8a2cdeb5e4ab5dd2987e0a4273bbaaaae
--- /dev/null
+++ b/content/modules/ROOT/pages/concepts.adoc
@@ -0,0 +1,14 @@
+= Concepts
+
+== Bias
+
+Definition::
+[[bias]]
+[quote, Bias]
+____
+...
+____
+
+Associated properties::
+* xref:definitions.adoc#fairness[Fairness]
+* xref:definitions.adoc#ethics[Ethics]
\ No newline at end of file
diff --git a/content/modules/ROOT/pages/index.adoc b/content/modules/ROOT/pages/index.adoc
index fa10addc9909e0982377662d08229bd34a5a671e..a625e214364d043cee881d50c23e1ee53736edf8 100644
--- a/content/modules/ROOT/pages/index.adoc
+++ b/content/modules/ROOT/pages/index.adoc
@@ -14,10 +14,14 @@ This web site is under construction.
 
 This documentation lists the set of:
 
-- properties xref:properties.adoc[definitions]
+- Properties xref:properties.adoc[definitions]
 ** xref:properties.adoc#fairness[Fairness]
-** ...
-- associated metrics
+** xref:properties.adoc#ethics[Ethics]
+- Associated concepts
+** xref:concepts.adoc#bias[Bias]
+** xref:concepts.adoc#discrimination[Discrimination]
+** xref:concepts.adoc#equity[Equity]
+- Associated metrics
 - ...
 
 == Contact
diff --git a/content/modules/ROOT/pages/properties.adoc b/content/modules/ROOT/pages/properties.adoc
index 1b6ad6d1f88b8c67844643c8d4b4594936784edf..70db9babedd5b7264cb3ff949fcda76205bbd0d9 100644
--- a/content/modules/ROOT/pages/properties.adoc
+++ b/content/modules/ROOT/pages/properties.adoc
@@ -2,8 +2,14 @@
 
 == Fairness
 
+Definition::
 [[fairness]]
 [quote, Fairness, Oxford Dictionary]
 ____
 Imperfect and just treatment or behavior without favoritism or discrimination.
-____
\ No newline at end of file
+____
+
+Associated concepts::
+* xref:concepts.adoc#bias[Bias]
+* Discrimination
+* Equity
\ No newline at end of file