diff --git a/b_asic/core_operations.py b/b_asic/core_operations.py
index ce1019f30ef712f9565c769491e4bf336d0f31bf..d06cbab3dc5356465bdc3c2f2b93c55f26715aed 100644
--- a/b_asic/core_operations.py
+++ b/b_asic/core_operations.py
@@ -35,7 +35,7 @@ class Constant(AbstractOperation):
         self._output_ports = [OutputPort(0, self)]
         self._parameters["value"] = value
 
-    def evaluate(self) -> Any:
+    def evaluate(self):
         return self.param("value")
 
     @property
@@ -59,7 +59,7 @@ class Addition(AbstractOperation):
         if source2 is not None:
             self._input_ports[1].connect_to_port(source2)
 
-    def evaluate(self, a, b) -> Any:
+    def evaluate(self, a, b):
         return a + b
 
     @property
@@ -82,11 +82,11 @@ class Subtraction(AbstractOperation):
         if source2 is not None:
             self._input_ports[1].connect_to_port(source2)
 
-    def evaluate(self, a, b) -> Any:
+    def evaluate(self, a, b):
         return a - b
 
     @property
-    def type_name(self) -> GraphIDType:
+    def type_name(self) -> TypeName:
         return "sub"
 
 
@@ -105,11 +105,11 @@ class Multiplication(AbstractOperation):
         if source2 is not None:
             self._input_ports[1].connect_to_port(source2)
 
-    def evaluate(self, a, b) -> Any:
+    def evaluate(self, a, b):
         return a * b
 
     @property
-    def type_name(self) -> GraphIDType:
+    def type_name(self) -> TypeName:
         return "mul"
 
 
@@ -128,11 +128,11 @@ class Division(AbstractOperation):
         if source2 is not None:
             self._input_ports[1].connect_to_port(source2)
 
-    def evaluate(self, a, b) -> Any:
+    def evaluate(self, a, b):
         return a / b
 
     @property
-    def type_name(self) -> GraphIDType:
+    def type_name(self) -> TypeName:
         return "div"
 
 
@@ -150,11 +150,11 @@ class SquareRoot(AbstractOperation):
             self._input_ports[0].connect_to_port(source1)
 
 
-    def evaluate(self, a) -> Any:
+    def evaluate(self, a):
         return sqrt((complex)(a))
 
     @property
-    def type_name(self) -> GraphIDType:
+    def type_name(self) -> TypeName:
         return "sqrt"
 
 
@@ -172,11 +172,11 @@ class ComplexConjugate(AbstractOperation):
             self._input_ports[0].connect_to_port(source1)
 
 
-    def evaluate(self, a) -> Any:
+    def evaluate(self, a):
         return conjugate(a)
 
     @property
-    def type_name(self) -> GraphIDType:
+    def type_name(self) -> TypeName:
         return "conj"
 
 
@@ -195,13 +195,13 @@ class Max(AbstractOperation):
         if source2 is not None:
             self._input_ports[1].connect_to_port(source2)
 
-    def evaluate(self, a, b) -> Any:
+    def evaluate(self, a, b):
         assert not isinstance(a, complex) and not isinstance(b, complex), \
-            ("core_operation.Max does not support complex numbers.")
+            ("core_operations.Max does not support complex numbers.")
         return a if a > b else b
 
     @property
-    def type_name(self) -> GraphIDType:
+    def type_name(self) -> TypeName:
         return "max"
 
 
@@ -220,13 +220,13 @@ class Min(AbstractOperation):
         if source2 is not None:
             self._input_ports[1].connect_to_port(source2)
 
-    def evaluate(self, a, b) -> Any:
+    def evaluate(self, a, b):
         assert not isinstance(a, complex) and not isinstance(b, complex), \
-            ("core_operation.Min does not support complex numbers.")
+            ("core_operations.Min does not support complex numbers.")
         return a if a < b else b
 
     @property
-    def type_name(self) -> GraphIDType:
+    def type_name(self) -> TypeName:
         return "min"
 
 
@@ -244,11 +244,11 @@ class Absolute(AbstractOperation):
             self._input_ports[0].connect_to_port(source1)
 
 
-    def evaluate(self, a) -> Any:
+    def evaluate(self, a):
         return np_abs(a)
 
     @property
-    def type_name(self) -> GraphIDType:
+    def type_name(self) -> TypeName:
         return "abs"
 
 
@@ -266,7 +266,7 @@ class ConstantMultiplication(AbstractOperation):
         if source1 is not None:
             self._input_ports[0].connect_to_port(source1)
 
-    def evaluate(self, a) -> Any:
+    def evaluate(self, a):
         return a * self.param("coefficient")
 
     @property
@@ -288,11 +288,11 @@ class ConstantAddition(AbstractOperation):
         if source1 is not None:
             self._input_ports[0].connect_to_port(source1)
 
-    def evaluate(self, a) -> Any:
+    def evaluate(self, a):
         return a + self.param("coefficient")
 
     @property
-    def type_name(self) -> GraphIDType:
+    def type_name(self) -> TypeName:
         return "cadd"
 
 
@@ -310,11 +310,11 @@ class ConstantSubtraction(AbstractOperation):
         if source1 is not None:
             self._input_ports[0].connect_to_port(source1)
 
-    def evaluate(self, a) -> Any:
+    def evaluate(self, a):
         return a - self.param("coefficient")
 
     @property
-    def type_name(self) -> GraphIDType:
+    def type_name(self) -> TypeName:
         return "csub"
 
 
@@ -332,9 +332,9 @@ class ConstantDivision(AbstractOperation):
         if source1 is not None:
             self._input_ports[0].connect_to_port(source1)
 
-    def evaluate(self, a) -> Any:
+    def evaluate(self, a):
         return a / self.param("coefficient")
 
     @property
-    def type_name(self) -> GraphIDType:
+    def type_name(self) -> TypeName:
         return "cdiv"
diff --git a/b_asic/operation.py b/b_asic/operation.py
index 75644b736bd7fd70ca9e1368c84927abcd42a713..fc007ffde91e596fc103e811677d7aab96241fa4 100644
--- a/b_asic/operation.py
+++ b/b_asic/operation.py
@@ -86,9 +86,9 @@ class Operation(GraphComponent):
 
     @property
     @abstractmethod
-    def neighbours(self) -> "List[Operation]":
+    def neighbors(self) -> "List[Operation]":
         """Return all operations that are connected by signals to this operation.
-        If no neighbours are found this returns an empty list
+        If no neighbors are found, this returns an empty list.
         """
         raise NotImplementedError
 
@@ -175,17 +175,17 @@ class AbstractOperation(Operation, AbstractGraphComponent):
         return [self]
 
     @property
-    def neighbours(self) -> List[Operation]:
-        neighbours: List[Operation] = []
+    def neighbors(self) -> List[Operation]:
+        neighbors: List[Operation] = []
         for port in self._input_ports:
             for signal in port.signals:
-                neighbours.append(signal.source.operation)
+                neighbors.append(signal.source.operation)
 
         for port in self._output_ports:
             for signal in port.signals:
-                neighbours.append(signal.destination.operation)
+                neighbors.append(signal.destination.operation)
 
-        return neighbours
+        return neighbors
 
     def traverse(self) -> Operation:
         """Traverse the operation tree and return a generator with start point in the operation."""
@@ -198,7 +198,7 @@ class AbstractOperation(Operation, AbstractGraphComponent):
         while queue:
             operation = queue.popleft()
             yield operation
-            for n_operation in operation.neighbours:
+            for n_operation in operation.neighbors:
                 if n_operation not in visited:
                     visited.add(n_operation)
                     queue.append(n_operation)