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diff --git a/compiler/loco/include/loco/IR/DataType.h b/compiler/loco/include/loco/IR/DataType.h
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+++ b/compiler/loco/include/loco/IR/DataType.h
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+/*
+ * Copyright (c) 2019 Samsung Electronics Co., Ltd. All Rights Reserved
+ *
+ * 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.
+ */
+
+#ifndef __LOCO_IR_DATA_TYPE_H__
+#define __LOCO_IR_DATA_TYPE_H__
+
+namespace loco
+{
+
+/**
+ * @brief "scalar" value type
+ */
+enum class DataType
+{
+  Unknown, // Unknown type (serves as a default value)
+
+  U8,  // 8-bit unsigned integer
+  U16, // 16-bit unsigned integer
+  U32, // 32-bit unsigned integer
+  U64, // 64-bit unsigned integer
+
+  S8,  // 8-bit signed integer
+  S16, // 16-bit signed integer
+  S32, // 32-bit signed integer
+  S64, // 64-bit signed integer
+
+  FLOAT16, // IEEE 16-bit floating-point
+  FLOAT32, // IEEE 32-bit floating-point
+  FLOAT64, // IEEE 64-bit floating-point
+
+  // WARNING the size of Bool may vary for NN frameworks
+  // TODO we need to find a way to resolve this issue
+  BOOL, // Boolean
+};
+
+} // namespace loco
+
+#endif // __LOCO_IR_DATA_TYPE_H__