diff --git a/defs/defs.py b/defs/defs.py
index d29d607..e1ded07 100644
--- a/defs/defs.py
+++ b/defs/defs.py
@@ -1,4 +1,39 @@
-class HelloWorld:
+### -------------------------------------------------------------------------------- ###
+### IMPORTS AND CONFIGURATIONS
 
-    def __init__(self, number):
+import os
+import pandas as pd
+
+### -------------------------------------------------------------------------------- ###
+### OFR ANALYSIS
+
+class OFRSample:
+
+    def __init__(self, number, diameterlist, countlist):
         self.number = number
+        self.diameterlist = diameterlist
+        self.countlist = countlist
+        self.samplelist = {}
+
+class OFRAnalyser:
+
+    def __init__(self, sourcefile):
+        self.sourcefile = sourcefile
+
+    def read(self, headlines = 238):
+        pass
+
+    def getTotalMass(self):
+        pass
+
+    def plotTimeSeries(self):
+        pass
+
+    def plotDistribution(self, sample):
+        pass
+
+    def plotAllDistributions(self):
+        pass
+
+### -------------------------------------------------------------------------------- ###
+###
\ No newline at end of file
diff --git a/vis/playground.ipynb b/vis/playground.ipynb
index a6620b9..caad0d7 100644
--- a/vis/playground.ipynb
+++ b/vis/playground.ipynb
@@ -6,37 +6,50 @@
    "metadata": {
     "collapsed": true,
     "ExecuteTime": {
-     "end_time": "2026-06-09T09:13:43.264516Z",
-     "start_time": "2026-06-09T09:13:43.260078Z"
+     "end_time": "2026-06-15T14:00:10.219007Z",
+     "start_time": "2026-06-15T14:00:09.797047Z"
     }
    },
-   "source": "from defs.defs import HelloWorld",
+   "source": "from defs.defs import OFRSample, OFRAnalyser",
    "outputs": [],
-   "execution_count": 6
+   "execution_count": 1
   },
   {
    "metadata": {
     "ExecuteTime": {
-     "end_time": "2026-06-09T09:14:07.016214Z",
-     "start_time": "2026-06-09T09:14:07.013319Z"
+     "end_time": "2026-06-15T14:00:11.740245Z",
+     "start_time": "2026-06-15T14:00:11.737126Z"
     }
    },
    "cell_type": "code",
-   "source": [
-    "hw = HelloWorld(number=4)\n",
-    "print(hw.number)"
-   ],
+   "source": "anlsyr = OFRAnalyser(sourcefile=\"/Volumes/5505/People/David_Tschan/data/OFR_SMPS/2026/processed/06_June/20260612/20260612_SET02_EXP01_full.csv\")",
    "id": "83604ca62804491c",
+   "outputs": [],
+   "execution_count": 2
+  },
+  {
+   "metadata": {
+    "ExecuteTime": {
+     "end_time": "2026-06-15T14:00:19.825781Z",
+     "start_time": "2026-06-15T14:00:19.820656Z"
+    }
+   },
+   "cell_type": "code",
+   "source": "anlsyr.sourcefile",
+   "id": "fc69589de06ec7c3",
    "outputs": [
     {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "4\n"
-     ]
+     "data": {
+      "text/plain": [
+       "'/Volumes/5505/People/David_Tschan/data/OFR_SMPS/2026/processed/06_June/20260612/20260612_SET02_EXP01_full.csv'"
+      ]
+     },
+     "execution_count": 3,
+     "metadata": {},
+     "output_type": "execute_result"
     }
    ],
-   "execution_count": 7
+   "execution_count": 3
   },
   {
    "metadata": {},
@@ -44,7 +57,7 @@
    "outputs": [],
    "execution_count": null,
    "source": "",
-   "id": "fc69589de06ec7c3"
+   "id": "84a36071715be21"
   }
  ],
  "metadata": {