diff --git a/ps-grammar/jgerlach_challenge/jgerlach_challenge.jsgf b/ps-grammar/jgerlach_challenge/jgerlach_challenge.jsgf
deleted file mode 100644
index 97e0759bcc751d3270c43bd3520d3aa160f1e9eb..0000000000000000000000000000000000000000
--- a/ps-grammar/jgerlach_challenge/jgerlach_challenge.jsgf
+++ /dev/null
@@ -1,5 +0,0 @@
-#JSGF V1.0;
-grammar jgerlach_challenge;
-public <roomNT> = (<kitchenNT> | <livingRoomNT>);
-<kitchenNT> =  [clean up the] kitchen;
-<livingRoomNT> = [clean up the] living room; 
diff --git a/ps-grammar/kgardeja/kgardeja.jsgf b/ps-grammar/kgardeja/kgardeja.jsgf
deleted file mode 100644
index dc54fe38e76bfe098763b04878be367e0b306fd3..0000000000000000000000000000000000000000
--- a/ps-grammar/kgardeja/kgardeja.jsgf
+++ /dev/null
@@ -1,13 +0,0 @@
-#JSGF V1.0;
-grammar kgardeja;
-public <statement> = <kitchen> | <livingroom> | <accept> | <cleankitchen> | <cleanlivingroom> | <decline> | <search> | <clean> | tobi <clean>;
-<kitchen> = kitchen;
-<clean> = clean | (clean up) | sort | (clean room) | (clean up room) | (tidy up) | (tidy up room) | start |  (start cleaning) |  (start searching) | search | (search for objects);
-<search> = search;
-<livingroom> = livingroom;
-<accept> = yes;
-<cleankitchen> = clean kitchen;
-<cleanlivingroom> = clean livingroom;
-<decline> = no;
-
-
diff --git a/ps-grammar/skoester/cleanUpskoester.jsgf b/ps-grammar/skoester/cleanUpskoester.jsgf
deleted file mode 100644
index 65a9311a536d06ba80b163c9a2f455ac18686ce5..0000000000000000000000000000000000000000
--- a/ps-grammar/skoester/cleanUpskoester.jsgf
+++ /dev/null
@@ -1,9 +0,0 @@
-#JSGF V1.0;
-grammar cleanUpskoester;
-
-public <statement> = (<kitchen> | <livingroom> | <yes> | <no>);
-
-<kitchen> = kitchen;
-<livingroom> = livingroom; 
-<yes> = yes;  
-<no> = no;