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diff --git a/include/diagram/statement.hpp b/include/diagram/statement.hpp
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+/*
+ * Statement.h
+ *
+ *  Created on: Nov 23, 2017
+ *      Author: naopross
+ */
+
+#ifndef SRC_DIAGRAM_STATEMENT_H_
+#define SRC_DIAGRAM_STATEMENT_H_
+
+#include <string>
+#include <memory>
+
+namespace samb {
+
+/*  Possible types of statement, according to the NS diagram paper
+ * 
+ * PROCESS  : a statement that does something
+ * SCOPE    : simple scope to isolate variables
+ * DECISION : splits the program in 2 branches based on a condition
+ * SWITCH   : splits the program in n branches depending on a value
+ * WHILE    : check first loop
+ * UNTIL    : check last loop
+ * PARALLEL : parallel operations
+ */
+
+/* This struct is a statement (link) of the iterable object Scope
+ * (linked list), that is also a common interface for the various types of
+ * statements.
+ */
+class Statement {
+public:
+    using pointer = std::shared_ptr<Statement>;
+
+    enum Type {
+        PROCESS,
+        SCOPE,
+        DECISION,
+        SWITCH,
+        WHILE,
+        UNTIL,
+        PARALLEL,
+    };
+
+    const Type type;
+
+    Statement(Type t, const std::string& text);
+    Statement(Type t, const std::string& text, pointer next);
+    virtual ~Statement();
+
+    bool operator==(const Statement& other) const;
+
+    /* accessors */
+    void next(pointer next) { m_next = next; }
+    pointer next() const { return m_next; }
+
+    void text(const std::string& text) { m_text = text; }
+    const std::string& text() const { return m_text; }
+
+private:
+    std::string m_text;
+    pointer m_next;
+};
+
+} /* namespace samb */
+
+#endif /* SRC_DIAGRAM_STATEMENT_H_ */