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diff --git a/yage/engine/system.h b/yage/engine/system.h
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+++ b/yage/engine/system.h
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+/** ---------------------------------------------------------------------------
+ * @file: system.h
+ *
+ * Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com>
+ * MIT License, see LICENSE file for more details.
+ * ----------------------------------------------------------------------------
+ */
+
+#ifndef YAGE_ENGINE_SYSTEM_H
+#define YAGE_ENGINE_SYSTEM_H
+
+namespace yage
+{
+
+/**
+ * System interface for the different systems in the engine.
+ */
+class System
+{
+public:
+    /// Virtual destructor to destroy all the objects that implement this
+    /// properly.
+    virtual ~System() = 0;
+
+    /// Initializes the system. Good practice to have this function instead
+    /// using the constructor.
+    virtual void init() = 0;
+
+    /// Updates the system at each interval using the time step.
+    virtual void update(double dt) = 0;
+};
+
+/// Implement the default destructor, but leaving it as purely virtual in the
+/// definition of the abstract class.
+inline yage::System::~System() {}
+
+} // namespace yage
+
+#endif