diff --git a/phosphor-regulators/src/system.hpp b/phosphor-regulators/src/system.hpp
new file mode 100644
index 0000000..3256c8d
--- /dev/null
+++ b/phosphor-regulators/src/system.hpp
@@ -0,0 +1,111 @@
+/**
+ * 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 "chassis.hpp"
+#include "id_map.hpp"
+#include "rule.hpp"
+
+#include <memory>
+#include <utility>
+#include <vector>
+
+namespace phosphor::power::regulators
+{
+
+/**
+ * @class System
+ *
+ * The computer system being controlled and monitored by the BMC.
+ *
+ * The system contains one or more chassis.  Chassis are large enclosures that
+ * can be independently powered off and on by the BMC.
+ */
+class System
+{
+  public:
+    // Specify which compiler-generated methods we want
+    System() = delete;
+    System(const System&) = delete;
+    System(System&&) = delete;
+    System& operator=(const System&) = delete;
+    System& operator=(System&&) = delete;
+    ~System() = default;
+
+    /**
+     * Constructor.
+     *
+     * @param rules rules used to monitor and control regulators in the system
+     * @param chassis chassis in the system
+     */
+    explicit System(std::vector<std::unique_ptr<Rule>> rules,
+                    std::vector<std::unique_ptr<Chassis>> chassis) :
+        rules{std::move(rules)},
+        chassis{std::move(chassis)}
+    {
+    }
+
+    /**
+     * Returns the chassis in the system.
+     *
+     * @return chassis
+     */
+    const std::vector<std::unique_ptr<Chassis>>& getChassis() const
+    {
+        return chassis;
+    }
+
+    /**
+     * Returns the IDMap for the system.
+     *
+     * The IDMap provides a mapping from string IDs to the associated Device,
+     * Rail, and Rule objects.
+     *
+     * @return IDMap
+     */
+    const IDMap& getIDMap() const
+    {
+        return idMap;
+    }
+
+    /**
+     * Returns the rules used to monitor and control regulators in the system.
+     *
+     * @return rules
+     */
+    const std::vector<std::unique_ptr<Rule>>& getRules() const
+    {
+        return rules;
+    }
+
+  private:
+    /**
+     * Rules used to monitor and control regulators in the system.
+     */
+    std::vector<std::unique_ptr<Rule>> rules{};
+
+    /**
+     * Chassis in the system.
+     */
+    std::vector<std::unique_ptr<Chassis>> chassis{};
+
+    /**
+     * Mapping from string IDs to the associated Device, Rail, and Rule objects.
+     */
+    IDMap idMap{};
+};
+
+} // namespace phosphor::power::regulators