diff --git a/src/main/java/cz/cvut/kbss/analysis/model/ava/ATASystem.java b/src/main/java/cz/cvut/kbss/analysis/model/ava/ATASystem.java
new file mode 100644
index 00000000..a18d5d5a
--- /dev/null
+++ b/src/main/java/cz/cvut/kbss/analysis/model/ava/ATASystem.java
@@ -0,0 +1,23 @@
+package cz.cvut.kbss.analysis.model.ava;
+
+import cz.cvut.kbss.analysis.model.Component;
+import cz.cvut.kbss.analysis.model.Item;
+import cz.cvut.kbss.analysis.model.System;
+import cz.cvut.kbss.analysis.util.Vocabulary;
+import cz.cvut.kbss.jopa.model.annotations.OWLClass;
+import cz.cvut.kbss.jopa.model.annotations.OWLDataProperty;
+import lombok.Getter;
+import lombok.Setter;
+
+/**
+ * This entity represents an ATA system category. It can be used as a supertype to categorize an Item.
+ */
+@OWLClass(iri = Vocabulary.s_c_ata_system)
+@Getter
+@Setter
+public class ATASystem extends Component {
+
+    @OWLDataProperty(iri = Vocabulary.s_p_ata_code)
+    private String ataCode;
+
+}
diff --git a/src/main/java/cz/cvut/kbss/analysis/model/ava/FHAEventType.java b/src/main/java/cz/cvut/kbss/analysis/model/ava/FHAEventType.java
new file mode 100644
index 00000000..f54341d2
--- /dev/null
+++ b/src/main/java/cz/cvut/kbss/analysis/model/ava/FHAEventType.java
@@ -0,0 +1,28 @@
+package cz.cvut.kbss.analysis.model.ava;
+
+import cz.cvut.kbss.analysis.model.Event;
+import cz.cvut.kbss.analysis.model.FaultEventType;
+import cz.cvut.kbss.analysis.model.method.VerificationMethod;
+import cz.cvut.kbss.analysis.util.Vocabulary;
+import cz.cvut.kbss.jopa.model.annotations.OWLClass;
+import cz.cvut.kbss.jopa.model.annotations.OWLDataProperty;
+import cz.cvut.kbss.jopa.model.annotations.OWLObjectProperty;
+import lombok.Getter;
+import lombok.Setter;
+
+import java.util.Set;
+
+@OWLClass(iri = Vocabulary.s_c_fha_fault_event)
+@Setter
+@Getter
+public class FHAEventType extends FaultEventType {
+
+    @OWLDataProperty(iri = Vocabulary.s_p_criticality)
+    private Set<Integer> criticality;
+
+    @OWLObjectProperty(iri = Vocabulary.s_c_verification_method)
+    private Set<VerificationMethod> verificationMethods;
+
+    @OWLDataProperty(iri = Vocabulary.s_p_material_reference)
+    private Set<String> referencedMaterials;
+}
diff --git a/src/main/java/cz/cvut/kbss/analysis/model/ava/IndependentSNSItem.java b/src/main/java/cz/cvut/kbss/analysis/model/ava/IndependentSNSItem.java
new file mode 100644
index 00000000..57956ba1
--- /dev/null
+++ b/src/main/java/cz/cvut/kbss/analysis/model/ava/IndependentSNSItem.java
@@ -0,0 +1,25 @@
+package cz.cvut.kbss.analysis.model.ava;
+
+import cz.cvut.kbss.analysis.model.Item;
+import cz.cvut.kbss.analysis.util.Vocabulary;
+import cz.cvut.kbss.jopa.model.annotations.OWLClass;
+import cz.cvut.kbss.jopa.model.annotations.OWLDataProperty;
+import lombok.Getter;
+import lombok.Setter;
+
+/**
+ * This entity represents a Kind (typeCategory should be set to Kind) of independent Item used as a component in the SNS
+ * partonomy identified by a partNumber and stock.
+ *
+ *
+ */
+@OWLClass(iri = Vocabulary.s_c_reusable_system)
+@Getter
+@Setter
+public class IndependentSNSItem extends Item {
+    @OWLDataProperty(iri = Vocabulary.s_p_part_number)
+    private String partNumber;
+
+    @OWLDataProperty(iri = Vocabulary.s_p_stock)
+    private String stock;
+}
diff --git a/src/main/java/cz/cvut/kbss/analysis/model/ava/SNSComponent.java b/src/main/java/cz/cvut/kbss/analysis/model/ava/SNSComponent.java
new file mode 100644
index 00000000..56ce1f1f
--- /dev/null
+++ b/src/main/java/cz/cvut/kbss/analysis/model/ava/SNSComponent.java
@@ -0,0 +1,27 @@
+package cz.cvut.kbss.analysis.model.ava;
+
+import cz.cvut.kbss.analysis.model.Component;
+import cz.cvut.kbss.analysis.util.Vocabulary;
+import cz.cvut.kbss.jopa.model.annotations.OWLClass;
+import cz.cvut.kbss.jopa.model.annotations.OWLDataProperty;
+import lombok.Getter;
+import lombok.Setter;
+
+import java.util.Set;
+
+
+/*
+ * This entity represents component from an SNS partonomy. The SNSComponent categorized as a IndependentSNSItem Kind and
+ * or an ATASystem.
+ */
+@OWLClass(iri = Vocabulary.s_c_sns_component)
+@Getter
+@Setter
+public class SNSComponent extends Component {
+    @OWLDataProperty(iri = Vocabulary.s_p_quantity)
+    private Integer quantity;
+
+    @OWLDataProperty(iri = Vocabulary.s_p_schematic_designation)
+    private Set<String> schematicDescription;
+
+}
diff --git a/src/main/java/cz/cvut/kbss/analysis/model/method/VerificationMethod.java b/src/main/java/cz/cvut/kbss/analysis/model/method/VerificationMethod.java
new file mode 100644
index 00000000..442bc6b8
--- /dev/null
+++ b/src/main/java/cz/cvut/kbss/analysis/model/method/VerificationMethod.java
@@ -0,0 +1,16 @@
+package cz.cvut.kbss.analysis.model.method;
+
+import cz.cvut.kbss.analysis.model.NamedEntity;
+import cz.cvut.kbss.analysis.util.Vocabulary;
+import cz.cvut.kbss.jopa.model.annotations.OWLClass;
+import cz.cvut.kbss.jopa.model.annotations.OWLDataProperty;
+import lombok.Getter;
+import lombok.Setter;
+
+@OWLClass(iri = Vocabulary.s_c_verification_method)
+@Getter
+@Setter
+public class VerificationMethod extends NamedEntity {
+    @OWLDataProperty(iri = Vocabulary.s_p_code)
+    public String code;
+}