diff --git a/Puffer_Speicher/form.json b/Puffer_Speicher/form.json
index 2c15012..1c2643a 100644
--- a/Puffer_Speicher/form.json
+++ b/Puffer_Speicher/form.json
@@ -65,26 +65,27 @@
             "type": "NumberSpinner",
             "name": "Stage1",
             "caption": "Stufe 1",
-            "visible": "{StageSelect} == '1' || {StageSelect} == '2' || {StageSelect} == '3' || {StageSelect} == '4'"
+            "visible": "{StageSelect} == '1'"
             },
             {
             "type": "NumberSpinner",
             "name": "Stage2",
             "caption": "Stufe 2",
-            "visible": "{StageSelect} == '2' || {StageSelect} == '3' || {StageSelect} == '4'"
+            "visible": "{StageSelect} == '1' && {StageSelect} == '2'"
             },
             {
             "type": "NumberSpinner",
             "name": "Stage3",
             "caption": "Stufe 3",
-            "visible": "{StageSelect} == '3' || {StageSelect} == '4'"
+            "visible": "{StageSelect} == '1' && {StageSelect} == '2' && {StageSelect} == '3'"
             },
             {
             "type": "NumberSpinner",
             "name": "Stage4",
             "caption": "Stufe 4",
-            "visible": "{StageSelect} >= 4"
-        },
+            "visible": "{StageSelect} == '1' && {StageSelect} == '2' && {StageSelect} == '3' && {StageSelect} == '4'"
+        }
+        ,
         {
             "type": "Label",
             "caption": "Endpunkte der Pufferfunktion bestimmen: VT = f(AT)"