diff --git a/src/SUMMARY.md b/src/SUMMARY.md
index b846a45..82d096d 100644
--- a/src/SUMMARY.md
+++ b/src/SUMMARY.md
@@ -5,7 +5,7 @@
 # Developer Guide
 - [Development](development/README.md)
     - [Understanding the Design Goals](development/design/README.md)
-        - [Actor System]()
+        - [Actor System](development/design/actor.md)
         - [Security Features](development/design/security.md)
         - [Microkernel](development/design/kernel.md)
         - [GUI](development/design/gui.md)
diff --git a/src/development/design/actor.md b/src/development/design/actor.md
index acc5c4c..ac9a063 100644
--- a/src/development/design/actor.md
+++ b/src/development/design/actor.md
@@ -1,4 +1,81 @@
 # Actor System
+```admonish question title="Why?"
+**Actors** work as an abstraction over data storage and messaging.
+It allows for all systems *(GUI, Programs, etc.)* to work together, and rely on the same features.
+It reduces work of implementation, and all implementations can use the functions.
+```
+
+## Features
+- Petnames
+- **OCAP** security
+- **HMAC** message verification
+
+```rust
+// Different possible types of actors (more to be added)
+enum ActorType {
+    GUI(Widget),
+    ProgramInterface,
+}
+
+// Possible states an actor can be in
+enum ActorState {
+    Receive,
+    Send,
+    Work,
+    Idle,
+}
+
+// Cryptographic keypair
+struct KeyPair {
+    privkey: u128,
+    pubkey: u128,
+}
+
+// The actor itself
+struct Actor<D: DataInterface> {
+    petname: Option<String>, // Human-meaningful petname (explored further down)
+    uuid: Uuid, // Unique identifier
+    namespace: Uuid, // Parent namespace of this actor
+    actor_type: ActorType,
+    state: ActorState,
+    keys: Option<KeyPair>, // Cryptographic keypair
+    creation_date: DateTime,
+    modified_date: DateTime,
+    data: Option<D>, // Optional data of the generic D type
+}
+
+impl Actor {
+    fn new(namespace: Uuid, a_type: ActorType) -> Self {
+        Actor {
+            petname: None,
+            uuid: Uuid::new(),
+            namespace: namespace,
+            actor_type: a_type,
+            state: ActorState::Idle,
+            keys: None,
+            creation_date:: now(),
+            modified_date: now(),
+            data: None,
+        }
+    };
+}
+
+impl KeyPair {
+    fn generate_keypair(&mut self) -> Self;
+    fn get_pubkey(&self) -> u128;
+    fn sign(&self, &[u8]) -> Result<&[u8], Error>;
+    fn verify_signature(&[u8], u128) -> Result<(), Error>;
+}
+
+trait FilesystemInterface { // Interfacing with the filesystem
+    fn read(&mut self) -> Result<(), Error>; // Read the data from the disk into the Actor using the Uuid as a search key
+    fn write(&self) -> Result<(), Error>; // Write the data to the disk using the Uuid as a key
+}
+
+trait DataInterface { // Necessary data functions
+    fn to_bytes(&self) -> Result<&[u8], Error>; // Convert the data into a byte array
+}
+```
 
 ## OCAP
 **TODO**