diff --git a/NaturalLanguageUnderstanding.py b/NaturalLanguageUnderstanding.py
new file mode 100644
index 0000000..f54e21a
--- /dev/null
+++ b/NaturalLanguageUnderstanding.py
@@ -0,0 +1,46 @@
+from UserActType import UserActType
+from UserAct import UserAct
+import re
+
+
+class NLU:
+
+    def __init__(self):
+        self.__actParsePatternList = [
+            (
+                r"(.*)(cze(ś|s)(ć|c)|witaj|dzie(ń|n) dobry)(.*)",
+                UserActType.WELCOME_MSG,
+                []
+            ),
+            (
+                r"(.*)(Jak (masz na imi(ę|e))|(si(ę|e) nazywasz))(.*)",
+                UserActType.REQUEST,
+                ["name"]
+            ),
+            (
+                r"(.*)((ż|z)egnaj)|(do widzenia)|(na razie)(.*)",
+                UserActType.BYE,
+                []
+            )
+        ]
+
+    def parseUserInput(self, text):
+        for pattern, actType, actParams in self.__actParsePatternList:
+            regex = re.compile(pattern, re.IGNORECASE)
+            match = regex.match(text)
+            if match:
+                return UserAct(actType, actParams)
+        return UserAct(UserActType.INVALID)
+
+
+if __name__ == "__main__":
+
+    nlu = NLU()
+
+    a = nlu.parseUserInput("czesc")
+    b = nlu.parseUserInput("jak masz na imie")
+    c = nlu.parseUserInput("zegnaj")
+
+    print(a)
+    print(b)
+    print(c)
diff --git a/UserAct.py b/UserAct.py
new file mode 100644
index 0000000..722b1bf
--- /dev/null
+++ b/UserAct.py
@@ -0,0 +1,32 @@
+from UserActType import UserActType
+
+
+class UserAct:
+    def __init__(self, actType, actParams = None):
+        if actType == None:
+            raise Exception('actType cannot be None')
+        self.__actType = actType
+
+        if actParams != None:
+            if type(actParams) is not list:
+                raise Exception(
+                    'actParams has wrong type: expected type \'list\', got \'{}\''.format(type(actParams)))
+            self.__actParams = actParams
+
+    def __repr__(self):
+        return "UserAct()"
+
+    def __str__(self):
+        return "actType:{} actParams:{}".format(self.__actType,self.__actParams)
+
+    def setActParams(self, actParams):
+        if type(actParams) is not list:
+            raise Exception(
+                'actParams has wrong type: expected type \'list\', got \'{}\''.format(type(actParams)))
+        self.__actParams = actParams
+
+    def getActParams(self):
+        return self.__actParams
+
+    def getActType(self):
+        return self.__actType
diff --git a/UserActType.py b/UserActType.py
new file mode 100644
index 0000000..d532331
--- /dev/null
+++ b/UserActType.py
@@ -0,0 +1,9 @@
+from enum import Enum, unique
+
+
+@unique
+class UserActType(Enum):
+    WELCOME_MSG = 0
+    REQUEST = 1
+    BYE = 2
+    INVALID = -1