diff --git a/monitor/system.hpp b/monitor/system.hpp
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+++ b/monitor/system.hpp
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+/**
+ * Copyright © 2020 IBM Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#pragma once
+
+#include "fan.hpp"
+#include "tach_sensor.hpp"
+#include "trust_manager.hpp"
+#include "types.hpp"
+
+#include <nlohmann/json.hpp>
+#include <sdbusplus/bus.hpp>
+#include <sdeventplus/event.hpp>
+
+#include <memory>
+#include <optional>
+#include <vector>
+
+namespace phosphor::fan::monitor
+{
+
+using json = nlohmann::json;
+
+class System
+{
+  public:
+    System() = delete;
+    System(const System&) = delete;
+    System(System&&) = delete;
+    System& operator=(const System&) = delete;
+    System& operator=(System&&) = delete;
+    ~System() = default;
+
+    /**
+     * Constructor
+     * Parses and populates the fan monitor trust groups and list of fans
+     *
+     * @param[in] mode - mode of fan monitor
+     * @param[in] bus - sdbusplus bus object
+     * @param[in] event - event loop reference
+     */
+    System(Mode mode, sdbusplus::bus::bus& bus,
+           const sdeventplus::Event& event);
+
+  private:
+    /* The mode of fan monitor */
+    Mode _mode;
+
+    /* The sdbusplus bus object */
+    sdbusplus::bus::bus& _bus;
+
+    /* The event loop reference */
+    const sdeventplus::Event& _event;
+
+    /* Trust manager of trust groups */
+    std::unique_ptr<phosphor::fan::trust::Manager> _trust;
+
+    /* List of fan objects to monitor */
+    std::vector<std::unique_ptr<Fan>> _fans;
+
+    /**
+     * @brief Retrieve the configured trust groups
+     *
+     * @param[in] jsonObj - JSON object to parse from
+     *
+     * @return List of functions applied on trust groups
+     */
+    const std::vector<CreateGroupFunction> getTrustGroups(const json& jsonObj);
+
+    /**
+     * @brief Retrieve the configured fan definitions
+     *
+     * @param[in] jsonObj - JSON object to parse from
+     *
+     * @return List of fan definition data on the fans configured
+     */
+    const std::vector<FanDefinition> getFanDefinitions(const json& jsonObj);
+};
+
+} // namespace phosphor::fan::monitor