diff --git a/plantuml/gilded-rose.png b/plantuml/gilded-rose.png
index 7a9f4cfb..3f79be92 100644
Binary files a/plantuml/gilded-rose.png and b/plantuml/gilded-rose.png differ
diff --git a/plantuml/gilded-rose.puml b/plantuml/gilded-rose.puml
index 63f3c7a5..1d36cb1d 100644
--- a/plantuml/gilded-rose.puml
+++ b/plantuml/gilded-rose.puml
@@ -1,5 +1,7 @@
 @startuml
 
+skinparam backgroundColor transparent
+
 start
 note left
     Do this for each item in the list.
diff --git a/plantuml/history/01_lower-both-values.puml b/plantuml/history/01_lower-both-values.puml
index 151691a5..8fa637bc 100644
--- a/plantuml/history/01_lower-both-values.puml
+++ b/plantuml/history/01_lower-both-values.puml
@@ -1,10 +1,8 @@
 @startuml
 
+skinparam backgroundColor transparent
+
 start
-note left
-    Do this for each item in the list.
-    An item has a name, a sell in value and a quality value
-end note
 
 :lower quality with 1;
 :lower sell in with 1;
diff --git a/plantuml/history/02_sell-by-passed.puml b/plantuml/history/02_sell-by-passed.puml
index 71d8559a..3b2c317d 100644
--- a/plantuml/history/02_sell-by-passed.puml
+++ b/plantuml/history/02_sell-by-passed.puml
@@ -1,10 +1,8 @@
 @startuml
 
+skinparam backgroundColor transparent
+
 start
-note left
-    Do this for each item in the list.
-    An item has a name, a sell in value and a quality value
-end note
 
 :lower quality with 1;
 :lower sell in with 1;
diff --git a/plantuml/history/03_quality-never-negative.puml b/plantuml/history/03_quality-never-negative.puml
index a0965397..b2b9ed7e 100644
--- a/plantuml/history/03_quality-never-negative.puml
+++ b/plantuml/history/03_quality-never-negative.puml
@@ -1,10 +1,8 @@
 @startuml
 
+skinparam backgroundColor transparent
+
 start
-note left
-    Do this for each item in the list.
-    An item has a name, a sell in value and a quality value
-end note
 
 if (quality > 0) then (yes)
     :lower quality with 1;
diff --git a/plantuml/history/04_aged-brie.puml b/plantuml/history/04_aged-brie.puml
index 7bdf78b9..7b74e874 100644
--- a/plantuml/history/04_aged-brie.puml
+++ b/plantuml/history/04_aged-brie.puml
@@ -1,10 +1,8 @@
 @startuml
 
+skinparam backgroundColor transparent
+
 start
-note left
-    Do this for each item in the list.
-    An item has a name, a sell in value and a quality value
-end note
 
 if (not "Aged Brie") then (yes)
     if (quality > 0) then (yes)
diff --git a/plantuml/history/05_quality-max-50.puml b/plantuml/history/05_quality-max-50.puml
index c76615b9..69cc86d0 100644
--- a/plantuml/history/05_quality-max-50.puml
+++ b/plantuml/history/05_quality-max-50.puml
@@ -1,10 +1,8 @@
 @startuml
 
+skinparam backgroundColor transparent
+
 start
-note left
-    Do this for each item in the list.
-    An item has a name, a sell in value and a quality value
-end note
 
 if (not "Aged Brie") then (yes)
     if (quality > 0) then (yes)
@@ -32,6 +30,7 @@ if (sell in < 0) then (yes)
         else (no)
         endif
     endif
+    else (no)
 endif
 
 stop
diff --git a/plantuml/history/06_sulfuras.puml b/plantuml/history/06_sulfuras.puml
index b464e40d..25350c1d 100644
--- a/plantuml/history/06_sulfuras.puml
+++ b/plantuml/history/06_sulfuras.puml
@@ -1,10 +1,8 @@
 @startuml
 
+skinparam backgroundColor transparent
+
 start
-note left
-    Do this for each item in the list.
-    An item has a name, a sell in value and a quality value
-end note
 
 if (not "Aged Brie") then (yes)
     if (quality > 0) then (yes)
diff --git a/plantuml/history/07_backstage-passes.puml b/plantuml/history/07_backstage-passes.puml
index 63f3c7a5..5d6f2fa3 100644
--- a/plantuml/history/07_backstage-passes.puml
+++ b/plantuml/history/07_backstage-passes.puml
@@ -1,10 +1,8 @@
 @startuml
 
+skinparam backgroundColor transparent
+
 start
-note left
-    Do this for each item in the list.
-    An item has a name, a sell in value and a quality value
-end note
 
 if (not "Aged Brie" and not "Backstage passes to a TAFKAL80ETC concert") then (yes)
     if (quality > 0) then (yes)
diff --git a/plantuml/readme.md b/plantuml/readme.md
index f5b5b006..9c577adb 100644
--- a/plantuml/readme.md
+++ b/plantuml/readme.md
@@ -9,9 +9,13 @@ Several alternatives are available to render PlantUML, see https://plantuml.com/
 ## Syntax
 For the syntax of activity diagrams in PlantUML, please refer to https://plantuml.com/activity-diagram-beta
 
-## Exercise
-You can find the original GildedRose challenge in the gilded-rose.puml file.
+## Workshop
+You can run this exercise as a workshop.
 
+During this workshop, you start off with a presentation explaining the domain, while filling out the testcases found under `plantuml/workshop`. After that, participants are invited to refactor the UML Activity Diagram, using the examples that were discovered during the presentation. 
+[The google slides can be found here](https://docs.google.com/presentation/d/1kkRnVQjZELcfuGoFXaiSY_HxbO4lPQnSgHRGQZIH2nU/edit?usp=sharing). 
+
+## History
 If you want to illustrate how this activity diagram got to this state, you can show the requirements and the files under the /history directory. These individual files show the evolution of the activity diagram.
 
 ## Original state
diff --git a/plantuml/workshop-materials/testcases.pdf b/plantuml/workshop-materials/testcases.pdf
new file mode 100644
index 00000000..be311e2d
Binary files /dev/null and b/plantuml/workshop-materials/testcases.pdf differ