diff --git a/src/sa/model/index.md b/src/sa/model/index.md
index 13875fb..405efe0 100644
--- a/src/sa/model/index.md
+++ b/src/sa/model/index.md
@@ -577,14 +577,145 @@ Exceed: >6 components (>1 decomposed) and >2 use case/process view
 
 ## Logical View
 
+The existing components in in this diagram are all the stateful components. All of them will be instances of the PostgreSQL 15 RDBMS ([sources here](https://github.com/postgres/postgres) and [specification here](https://www.postgresql.org/docs/15/index.html)), a _free as in beer_ and FOSS piece of software. 
+
+```puml
+@startuml
+skinparam componentStyle rectangle
+
+!include <tupadr3/font-awesome/database>
+
+title Smarthut.sm Logical View
+
+interface " " as DF
+interface " " as DIF
+interface " " as TF
+interface " " as SCF
+interface " " as UIF
+
+[Smart device] as D
+[Smart sensor] as S
+[User Interface] as UI
+
+component "Users and Devices" as DEV {
+  interface " " as DIDBF
+
+  [Device Engine] as DI
+  [User and Device DB <$database{scale=0.33}>] as DIDB
+
+  DIDBF-DIDB
+  DI -( DIDBF
+}
+
+component "Triggers and Automations" as TRIG {
+  interface " " as TDBF
+
+  [Trigger and Automation Engine] as T
+  [Trigger and Automation DB <$database{scale=0.33}>] as TDB
+
+  TDBF-TDB
+  T -( TDBF
+}
+
+component "Scenes" as SCENE {
+  interface " " as SCDBF
+
+  [Scene Engine] as SC
+  [Scene DB <$database{scale=0.33}>] as SCDB
+
+  SCDBF-SCDB
+  SC -( SCDBF
+}
+
+D--DF
+UI--UIF
+DIF--DI
+TF--T
+SCF--SC
+
+S --( DIF
+D --( DIF
+DI --( TF
+T --( SCF
+DIF )-- SC
+DF )-- DI
+UIF )-- DI
+UI --( DIF
+UI --( SCF
+UI --( TF
+
+skinparam monochrome true
+skinparam shadowing false
+skinparam defaultFontName Courier
+@enduml
+```
 
 
 ## Process Views
 
-Use Case: 
+Use Case: A smart sensor 'S' reports a value which satisfies the condition defined in a trigger. Thanks to an automation specification, this in turn triggers the application of a scene which changes the state of smart device 'D'.
+
+```puml
+@startuml
+title Process View: Sensor triggers trigger and scene application
+
+participant "Smart device 'D'" as D
+participant "Smart sensor 'S'" as S
+participant "User Interface" as UI
+participant "Device Engine" as DI
+participant "User and Device DB" as DIDB
+participant "Trigger and Automation Engine" as T
+participant "Trigger and Automation DB" as TDB
+participant "Scene Engine" as SC
+participant "Scene DB" as SCDB
+
+S -> DI: report new value
+DI -> DIDB: store new value
+DI -> UI: display new value
+DI -> T: report latest device state
+T -> TDB: query for relevant triggers
+T -> TDB: query for triggered automations
+T -> TDB: query for scenes included in automation
+T -> SC: request scene application
+SC -> SCDB: query for device states to apply
+SC -> DI: request application of new state to device 'D'
+DI -> D: apply new state
+D -> DI: report successful application
+DI -> DIDB: store new state
+DI -> UI: display new state
 
 
 
+skinparam monochrome true
+skinparam shadowing false
+skinparam defaultFontName Courier
+@enduml
+```
+
+Use case: a user alters manually the state of a device in the UI, and the device updates accordingly.
+
+```puml
+@startuml
+title Process View: Sensor triggers trigger and scene application
+
+participant "Smart device 'D'" as D
+participant "Smart sensor 'S'" as S
+participant "User Interface" as UI
+participant "Device Engine" as DI
+participant "User and Device DB" as DIDB
+participant "Trigger and Automation Engine" as T
+participant "Trigger and Automation DB" as TDB
+participant "Scene Engine" as SC
+participant "Scene DB" as SCDB
+
+
+
+skinparam monochrome true
+skinparam shadowing false
+skinparam defaultFontName Courier
+@enduml
+```
+
 # Ex - Component Model: Bottom-Up
 
 {.instructions