diff --git a/com.sap.sailing.domain/src/com/sap/sailing/domain/base/Nationality.java b/com.sap.sailing.domain/src/com/sap/sailing/domain/base/Nationality.java
new file mode 100644
index 00000000000..2476689e3a1
--- /dev/null
+++ b/com.sap.sailing.domain/src/com/sap/sailing/domain/base/Nationality.java
@@ -0,0 +1,6 @@
+package com.sap.sailing.domain.base;
+
+
+public interface Nationality extends Named, WithImage {
+	String getThreeLetterAcronym();
+}
diff --git a/com.sap.sailing.domain/src/com/sap/sailing/domain/base/Person.java b/com.sap.sailing.domain/src/com/sap/sailing/domain/base/Person.java
new file mode 100644
index 00000000000..8d0e0233cd8
--- /dev/null
+++ b/com.sap.sailing.domain/src/com/sap/sailing/domain/base/Person.java
@@ -0,0 +1,8 @@
+package com.sap.sailing.domain.base;
+
+import java.util.Date;
+
+public interface Person extends Named, WithImage {
+	Date getDateOfBirth();
+
+}
diff --git a/com.sap.sailing.domain/src/com/sap/sailing/domain/base/RaceDefinition.java b/com.sap.sailing.domain/src/com/sap/sailing/domain/base/RaceDefinition.java
new file mode 100644
index 00000000000..b48cd3706a4
--- /dev/null
+++ b/com.sap.sailing.domain/src/com/sap/sailing/domain/base/RaceDefinition.java
@@ -0,0 +1,6 @@
+package com.sap.sailing.domain.base;
+
+public interface RaceDefinition extends Named {
+	Course getCourse();
+	Iterable<Boat> getBoats();
+}
diff --git a/com.sap.sailing.domain/src/com/sap/sailing/domain/base/Sailor.java b/com.sap.sailing.domain/src/com/sap/sailing/domain/base/Sailor.java
new file mode 100644
index 00000000000..5055f83a47b
--- /dev/null
+++ b/com.sap.sailing.domain/src/com/sap/sailing/domain/base/Sailor.java
@@ -0,0 +1,4 @@
+package com.sap.sailing.domain.base;
+
+public interface Sailor extends Person {
+}
diff --git a/com.sap.sailing.domain/src/com/sap/sailing/domain/base/Team.java b/com.sap.sailing.domain/src/com/sap/sailing/domain/base/Team.java
new file mode 100644
index 00000000000..a79f7d09508
--- /dev/null
+++ b/com.sap.sailing.domain/src/com/sap/sailing/domain/base/Team.java
@@ -0,0 +1,5 @@
+package com.sap.sailing.domain.base;
+
+public interface Team extends Named {
+	Iterable<Sailor> getSailors();
+}
diff --git a/com.sap.sailing.domain/src/com/sap/sailing/domain/base/TeamOnBoat.java b/com.sap.sailing.domain/src/com/sap/sailing/domain/base/TeamOnBoat.java
new file mode 100644
index 00000000000..01fd044bf78
--- /dev/null
+++ b/com.sap.sailing.domain/src/com/sap/sailing/domain/base/TeamOnBoat.java
@@ -0,0 +1,6 @@
+package com.sap.sailing.domain.base;
+
+public interface TeamOnBoat {
+	Team getTeam();
+	Boat getBoat();
+}
diff --git a/com.sap.sailing.domain/src/com/sap/sailing/domain/base/WithImage.java b/com.sap.sailing.domain/src/com/sap/sailing/domain/base/WithImage.java
new file mode 100644
index 00000000000..84d9712b16c
--- /dev/null
+++ b/com.sap.sailing.domain/src/com/sap/sailing/domain/base/WithImage.java
@@ -0,0 +1,7 @@
+package com.sap.sailing.domain.base;
+
+import java.io.InputStream;
+
+public interface WithImage {
+	InputStream getImage();
+}
diff --git a/com.sap.sailing.domain/src/com/sap/sailing/domain/tracking/MarkRounding.java b/com.sap.sailing.domain/src/com/sap/sailing/domain/tracking/MarkRounding.java
new file mode 100644
index 00000000000..68c782ee888
--- /dev/null
+++ b/com.sap.sailing.domain/src/com/sap/sailing/domain/tracking/MarkRounding.java
@@ -0,0 +1,10 @@
+package com.sap.sailing.domain.tracking;
+
+import com.sap.sailing.domain.base.Boat;
+import com.sap.sailing.domain.base.Mark;
+import com.sap.sailing.domain.base.Timed;
+
+public interface MarkRounding extends Timed {
+	Mark getMark();
+	Boat getBoat();
+}