diff --git a/pyrelacs/config/config_loader.py b/pyrelacs/config/config_loader.py
index c6c5f4c..d197e10 100644
--- a/pyrelacs/config/config_loader.py
+++ b/pyrelacs/config/config_loader.py
@@ -1,3 +1,4 @@
+from typing import TypedDict, Union
 from dataclasses import dataclass
 import pathlib
 
@@ -8,6 +9,75 @@ from pyrelacs.util.logging import config_logging
 
 log = config_logging()
 
+class ValueUnit(TypedDict):
+    value: Union[int, float]
+    unit: str
+
+@dataclass
+class Settings:
+    Repros: list[str]
+    Path: str
+
+
+@dataclass
+class Metadata:
+    Identifier: str
+    Maintainer: str
+    Creator: str
+    Location: str
+    Lab: str
+    Institute: str
+    University: str
+    Address: str
+
+@dataclass
+class Input:
+    inputsamplerate    : ValueUnit
+    # BufferSize
+    inputtracecapacity : ValueUnit
+    inputunipolar      : bool
+    inputtraceid       : list[str]
+    inputtracescale    : list[int]
+    inputtraceunit     : list[str]
+    inputtracedevice   : list[str]
+    inputtracechannel  : list[int]
+    inputtracereference: list[str]
+    inputtracemaxvalue : list[int]
+    inputtracecenter   : list[bool]
+
+@dataclass
+class Output:
+        outputtraceid      : list[str]
+        outputtracedevice  : list[str]
+        outputtracechannel : list[int]
+        outputtracescale   : list[int]
+        outputtraceunit    : list[str]
+        outputtracemaxrate : list[ValueUnit]
+        outputtracemodality: list[str]
+
+@dataclass
+class Data:
+    input: Input
+    output: Output
+
+@dataclass
+class SimData:
+      input:
+        inputsamplerate    : 20kHz
+        inputtracecapacity : 600s
+      output:
+        outputtraceid      : [ Sinus ]
+        outputtracedevice  : [ ao-0 ]
+        outputtracechannel : [ 0 ]
+        outputtracescale   : [ 1 ]
+        outputtraceunit    : [ V ] 
+        outputtracemaxrate : [ 40kHz ]
+        outputtracemodality: [ electric ]
+
+@dataclass
+class PyRelacs:
+    data: Data
+    simdata: SimData
 
 @dataclass
 class Config: