diff --git a/types.hpp b/types.hpp
index 260deb5..61f3d68 100644
--- a/types.hpp
+++ b/types.hpp
@@ -27,6 +27,11 @@
 
 using InterfaceList = std::vector<std::string>;
 
+using DbusInterfaceMap = std::map<DbusInterface, PropertyMap>;
+
+using ObjectValueTree =
+    std::map<sdbusplus::message::object_path, DbusInterfaceMap>;
+
 namespace sensor
 {
 
@@ -183,6 +188,34 @@
 
 using InvObjectIDMap = std::map<InventoryPath, SelData>;
 
+enum class ThresholdMask
+{
+    NON_CRITICAL_LOW_MASK = 0x01,
+    CRITICAL_LOW_MASK = 0x02,
+    NON_CRITICAL_HIGH_MASK = 0x08,
+    CRITICAL_HIGH_MASK = 0x10,
+};
+
+enum class ThresholdIndex
+{
+    NON_CRITICAL_LOW_IDX = 0,
+    CRITICAL_LOW_IDX = 1,
+    NON_RECOVERABLE_LOW_IDX = 2,
+    NON_CRITICAL_HIGH_IDX = 3,
+    CRITICAL_HIGH_IDX = 4,
+    NON_RECOVERABLE_HIGH_IDX = 5,
+};
+
+struct ThresholdLevel
+{
+    std::string property;
+    ThresholdMask maskValue;
+    ThresholdIndex idx;
+};
+
+using SensorThresholds = std::vector<ThresholdLevel>;
+using Thresholds = std::map<std::string, SensorThresholds>;
+
 }// namespace sensor
 
 namespace network