diff --git a/simphony/time_domain/__init__.py b/simphony/time_domain/__init__.py
new file mode 100644
index 0000000..2b4cc38
--- /dev/null
+++ b/simphony/time_domain/__init__.py
@@ -0,0 +1 @@
+"""Time Domain Simphony"""
diff --git a/simphony/time_domain/pole_residue_model.py b/simphony/time_domain/pole_residue_model.py
new file mode 100644
index 0000000..e0a7016
--- /dev/null
+++ b/simphony/time_domain/pole_residue_model.py
@@ -0,0 +1,19 @@
+class PoleResidueModel():
+    def __init__(self) -> None:
+        pass
+    
+
+class CVFModel(PoleResidueModel):
+    def __init__(self) -> None:
+        pass
+
+class CVFModelBaseband(PoleResidueModel):
+    def __init__(self) -> None:
+        pass
+
+
+class IIRModelBaseband(PoleResidueModel):
+    def __init__(self) -> None:
+        pass
+
+
diff --git a/simphony/time_domain/quantum.py b/simphony/time_domain/quantum.py
new file mode 100644
index 0000000..e69de29
diff --git a/simphony/time_domain/simulation.py b/simphony/time_domain/simulation.py
new file mode 100644
index 0000000..e69de29
diff --git a/simphony/time_domain/time_system.py b/simphony/time_domain/time_system.py
new file mode 100644
index 0000000..1e12c5d
--- /dev/null
+++ b/simphony/time_domain/time_system.py
@@ -0,0 +1,4 @@
+class TimeSystem():
+    def __init__(self) -> None:
+        pass
+    
\ No newline at end of file
diff --git a/simphony/time_domain/utils.py b/simphony/time_domain/utils.py
new file mode 100644
index 0000000..4791f2f
--- /dev/null
+++ b/simphony/time_domain/utils.py
@@ -0,0 +1,6 @@
+from simphony.time_domain import TimeSystem
+from simphony.time_domain import PoleResidueModel
+
+def pole_residue_to_time_system(poe_residue_model: PoleResidueModel) -> TimeSystem:
+    pass
+