diff --git a/src/main/asciidoc/models/design/seq_order.puml b/src/main/asciidoc/models/design/seq_order.puml
new file mode 100644
index 0000000..3405316
--- /dev/null
+++ b/src/main/asciidoc/models/design/seq_order.puml
@@ -0,0 +1,79 @@
+@startuml
+
+participant Customer
+participant OrderController
+participant Cart
+participant OrderManagement
+participant Spring
+participant "order1:CustomOrder" as order1
+
+== Add products to an event ==
+Customer --> OrderController : event(Model model)
+activate Customer
+activate OrderController
+OrderController --> Cart : iterator()
+activate Cart
+OrderController <-- Cart : Iterator<CartItem>
+deactivate Cart
+OrderController --> Spring : model.addAttribute()
+activate Spring
+OrderController <-- Spring : Model
+deactivate Spring
+Customer <-- OrderController : "event.html"
+deactivate OrderController
+Customer --> OrderController : addProduct()
+activate OrderController
+OrderController --> Cart : addOrUpdateItem()
+activate Cart
+OrderController <-- Cart
+deactivate Cart
+OrderController --> Spring : model.addAttribute()
+activate Spring
+OrderController <-- Spring : Model
+deactivate Spring
+Customer <-- OrderController : "redirect:/event.html"
+deactivate OrderController
+deactivate Customer
+
+== Checkout (finish event planning) ==
+Customer --> OrderController : checkout()
+activate Customer
+activate OrderController
+create order1
+OrderController --> order1 : new Order()
+activate order1
+OrderController <-- order1 : Order
+deactivate order1
+OrderController --> Cart : addItemsTo(order1)
+activate Cart
+OrderController <-- Cart
+deactivate Cart
+OrderController --> OrderManagement : payOrder(order1)
+activate OrderManagement
+OrderController <-- OrderManagement
+OrderController --> OrderManagement : completeOrder(order1)
+OrderController <-- OrderManagement
+deactivate OrderManagement
+OrderController --> Cart : clear()
+activate Cart
+OrderController <-- Cart
+deactivate Cart
+Customer <-- OrderController : "redirect:/cart.html"
+deactivate Customer
+deactivate OrderController
+
+== List orders ==
+Customer --> OrderController : orders()
+activate Customer
+activate OrderController
+OrderController --> OrderManagement : findAll()
+activate OrderManagement
+OrderController <-- OrderManagement : Page<CustomOrder>
+deactivate OrderManagement
+OrderController --> Spring : model.addAttribute()
+activate Spring
+OrderController <-- Spring : Model
+deactivate Spring
+Customer <-- OrderController : "orders.html"
+
+@enduml
\ No newline at end of file
diff --git a/src/main/asciidoc/models/design/seq_order.svg b/src/main/asciidoc/models/design/seq_order.svg
new file mode 100644
index 0000000..88f09b4
--- /dev/null
+++ b/src/main/asciidoc/models/design/seq_order.svg
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:944840e0463d867d4d72a6656faae37d3d761af976ae9d738dcd416228e0496b
+size 21754