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diff --git a/meowpp/utility/operation.h b/meowpp/utility/operation.h
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+++ b/meowpp/utility/operation.h
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+/*!
+ * @file operation.h
+ * @brief Contains a base class for most of all operations in meowpp.
+ *
+ * @author cathook
+ */
+
+#ifndef __MEOWPP_UTILITY_OPERATION_H__
+#define __MEOWPP_UTILITY_OPERATION_H__
+
+#include "../debug/assert.h"
+#include "object.h"
+#include "pointer.h"
+#include "state.h"
+
+namespace meow {
+
+
+/*!
+ * @brief Base class for operations.
+ */
+class Operation : public Object {
+ private:
+  int inputs_size_;
+  int outputs_size_;
+
+ protected:
+
+  /*!
+   * @brief A protected constructor to prevent developers create an instance of
+   *     Operation directly.
+   * @param arg_inputs_size Number of inputs for the operation.
+   * @param arg_outputs_size Number of outputs for the operation.
+   */
+  Operation(int arg_inputs_size, int arg_outputs_size) :
+      inputs_size_(arg_inputs_size), outputs_size_(arg_outputs_size) {}
+
+ public:
+
+  /*!
+   * @brief Virtual destructor.
+   */
+  virtual ~Operation() {}
+
+  /*!
+   * @brief Pure virtual method for running the operation.
+   * @param [in] inputs_ptr An array with each elements being a pointer points
+   *     to the input elements.
+   * @param [out] outputs_ptr An array with each elements being a pointer points
+   *     to the output elements.
+   * @return The state of the operation (ex: fail, success, ...)
+   */
+  virtual State Operate(Pointer<Object const> const * inputs_ptr,
+                        Pointer<Object> const * outputs_ptr) const = 0;
+
+  /*!
+   * @brief Gets the number of inputs for the operation.
+   * @return Number of inputs.
+   */
+  int inputs_size() const {
+    return inputs_size_;
+  }
+
+  /*!
+   * @brief Gets the number of outputs for the operation.
+   * @return Number of outputs.
+   */
+  int outputs_size() const {
+    return outputs_size_;
+  }
+
+#ifdef MEOWPP_UTILITY_OPERATION_TESTING
+  friend class OperationTest;
+#endif // MEOWPP_UTILITY_OPERATION_TESTING
+
+};
+
+}  // meow
+
+#endif  // __MEOWPP_UTILITY_OPERATION_H__