diff --git a/README.md b/README.md
index 6d9fbfe8e2..ceaac09643 100644
--- a/README.md
+++ b/README.md
@@ -8,13 +8,13 @@
 
 ## Documentation
 
-* [**Getting Started**](doc/getting_started.md)
-* [**Roadmap**](doc/roadmap.md)
-* [**Deep Dive AppFlowy**](doc/architecture.md)
+* [**Getting Started**](doc/GETTING_STARTED.md)
+* [**Roadmap**](doc/ROADMAP.md)
+* [**Deep Dive AppFlowy**](doc/APPFLOWY_SYSTEM_DESIGN.md)
 
 
 ## Contributing
-Read the [Contributing Doc](doc/contribute.md) before you want to contribute.
+Read the [Contributing Doc](doc/CONTRIBUTING.md) before you want to contribute.
 
 ## Social Media
 * Slack (to be determined)
diff --git a/app_flowy/packages/flowy_sdk/lib/dispatch/error.dart b/app_flowy/packages/flowy_sdk/lib/dispatch/error.dart
new file mode 100644
index 0000000000..ae47d60418
--- /dev/null
+++ b/app_flowy/packages/flowy_sdk/lib/dispatch/error.dart
@@ -0,0 +1,30 @@
+import 'package:flowy_logger/flowy_logger.dart';
+import 'package:flowy_sdk/dispatch/flowy_error.dart';
+import 'package:flowy_sdk/protobuf/ffi_request.pb.dart';
+import 'package:flowy_sdk/protobuf/ffi_response.pb.dart';
+
+class StackTraceError {
+  Object error;
+  StackTrace trace;
+  StackTraceError(
+    this.error,
+    this.trace,
+  );
+
+  FlowyError toFlowyError() {
+    Log.error('${error.runtimeType}\n');
+    Log.error('Stack trace \n $trace');
+    return FlowyError.fromError('${error.runtimeType}. Stack trace: $trace');
+  }
+
+  String toString() {
+    return '${error.runtimeType}. Stack trace: $trace';
+  }
+}
+
+FFIResponse error_response(FFIRequest request, StackTraceError error) {
+  var response = FFIResponse();
+  response.code = FFIStatusCode.Err;
+  response.error = error.toString();
+  return response;
+}
diff --git a/doc/about app flowy.md b/doc/ABOUT_APPFLOWY.md
similarity index 100%
rename from doc/about app flowy.md
rename to doc/ABOUT_APPFLOWY.md
diff --git a/doc/APPFLOWY_SYSTEM_DESIGN.md b/doc/APPFLOWY_SYSTEM_DESIGN.md
new file mode 100644
index 0000000000..e99cb9690c
--- /dev/null
+++ b/doc/APPFLOWY_SYSTEM_DESIGN.md
@@ -0,0 +1,71 @@
+# 🥳 AppFlowy - Event Driven System 
+
+* Goals of the System
+* Some Design Considerations
+* High Level Design
+* Component Design 
+
+## 🎯 Goals of the System
+The AppFlowy project is an attempt to build a high performance application. Here are the top-level requirements for out system.
+
+1. **High Performance.** 
+2. **Cross-platform.**
+3. **Reliability**
+4. **Safety**
+
+
+## 🤔 Some Design Considerations
+
+## 📜 High Level Design
+
+## 📚 Component Design
+
+### 📙 Event Dispatch
+
+```
+                        Frontend                                                     FLowySDK
+                                                             │                                              ┌─────────┐
+                                                             │                                          ┌7─▶│Handler A│
+                                                             │                                          │   └─────────┘
+                                                             │                             ┌─────────┐  │   ┌─────────┐
+┌──────┐    ┌────┐    ┌──────────────┐                       │                        ┌───▶│Module A │──┼──▶│Handler B│
+│Widget│─1─▶│Bloc│─2─▶│ Repository A │─3─┐                   │                        │    └─────────┘  │   └─────────┘
+└──────┘    └────┘    └──────────────┘   │                   │                        │                 │   ┌─────────┐
+                      ┌──────────────┐   │    ┌───────┐    ┌─┴──┐     ┌───────────┐   │    ┌─────────┐  └──▶│Handler C│
+                      │ Repository B │───┼───▶│ Event │─4─▶│FFI │─5──▶│Dispatcher │─6─┼───▶│Module B │      └─────────┘
+                      └──────────────┘   │    └───────┘    └─┬──┘     └───────────┘   │    └─────────┘
+                      ┌──────────────┐   │                   │                        │
+                      │ Repository C │───┘                   │                        │    ┌─────────┐
+                      └──────────────┘                       │                        └───▶│Module C │
+                                                             │                             └─────────┘
+                                                             │
+                                                             │
+```
+Here are the event flow: 
+1. User click on the `Widget`(The user interface) that invokes the `Bloc` actions
+2. `Bloc` calls the repositories to perform additional operations to handle the actions.
+3. `Repository` offers the functionalities by combining the event, defined in the `FlowySDK`.
+4. `Events` will be passed in the `FlowySDK` through the [FFI](https://en.wikipedia.org/wiki/Foreign_function_interface) interface.
+5. `Dispatcher` parses the event and generates the specific action scheduled in the `FlowySDK` runtime.
+6. `Dispatcher` find the event handler declared by the modules.
+7. `Handler` consumes the event and generates the response. The response will be returned to the widget through the `FFI`.
+
+The event flow will be discussed in two parts: the frontend implemented in flutter and the FlowySDK implemented in Rust.
+
+#### Frontend
+The Frontend follows the DDD design pattern, you can recap from [**here**](DOMAIN_DRIVEN_DESIGN.md).
+```
+    ┌──────┐        ┌────┐        ┌──────────────┐
+    │Widget│──1────▶│Bloc│──2────▶│ Repository A │─3──┐
+    └──────┘        └────┘        └──────────────┘    │
+                                  ┌──────────────┐    │     ┌───────┐
+                                  │ Repository B │────┼────▶│ Event │
+                                  └──────────────┘    │     └───────┘
+                                  ┌──────────────┐    │
+                                  │ Repository C │────┘
+                                  └──────────────┘
+```
+
+#### FlowySDK
+
+
diff --git a/CONTRIBUTING.md b/doc/CONTRIBUTING.md
similarity index 99%
rename from CONTRIBUTING.md
rename to doc/CONTRIBUTING.md
index a97294257e..630c62a729 100644
--- a/CONTRIBUTING.md
+++ b/doc/CONTRIBUTING.md
@@ -18,7 +18,6 @@ Consult the Table of Contents below, and jump to the desired section.
 - [Code of Conduct](#code-of-conduct)
 
 
-
 ## Sign the CLA Agreement
 
 TODO
diff --git a/doc/domain driven design.md b/doc/DOMAIN_DRIVEN_DESIGN.md
similarity index 100%
rename from doc/domain driven design.md
rename to doc/DOMAIN_DRIVEN_DESIGN.md
diff --git a/doc/architecture.md b/doc/architecture.md
deleted file mode 100644
index ddac0254f5..0000000000
--- a/doc/architecture.md
+++ /dev/null
@@ -1,47 +0,0 @@
-# 🥳 AppFlowy System Design
-
-* Goals of the System
-* Some Design Considerations
-* High Level Design
-* Component Design 
-
-## 🎯 Goals of the System
-
-
-
-## 🤔 Some Design Considerations
-
-## 📜 High Level Design
-
-## 📚 Component Design
-    
-### 📕 Component 1
-
-
-### 📗 Component 2
-
-
-### 📘 Flutter Event Flow
-
-
-### 📙 Rust Event Flow
-
-```
-                                                                          ┌─────────┐
-                                                                       ┌─▶│Service A│
-                                                                       │  └─────────┘
-                           ┌─────────┐  ┌───────────┐  ┌─────────────┐ │  ┌─────────┐
-                        ┌─▶│Module A │─▶│ Services  │─▶│Deps Resolved│─┼─▶│Service B│
-                        │  └─────────┘  └───────────┘  └─────────────┘ │  └─────────┘
-                        │                                              │  ┌─────────┐
-┌───────┐   ┌────────┐  │  ┌─────────┐                                 └─▶│Service C│
-│ Event │──▶│Runtime │──┼─▶│Module B │                                    └─────────┘
-└───────┘   └────────┘  │  └─────────┘
-                        │
-                        │  ┌─────────┐
-                        └─▶│Module C │
-                           └─────────┘
-```
-
-* sync will cause typing lag
-
diff --git a/doc/contribute.md b/doc/contribute.md
deleted file mode 100644
index e0f57bdaf8..0000000000
--- a/doc/contribute.md
+++ /dev/null
@@ -1,12 +0,0 @@
-[WIP]
-* Contributing
-    * First steps
-    * Opening issues
-    * Participating in discussions
-    * Finding something to work on
-    * Open your PR
-    * Review Process
-    * Getting more involved
-        * Organization membership
-        * Contributor
-        * Maintainer
\ No newline at end of file
diff --git a/doc/why flutter and rust.md b/doc/why flutter and rust.md
deleted file mode 100644
index 0e3d959cf3..0000000000
--- a/doc/why flutter and rust.md	
+++ /dev/null
@@ -1 +0,0 @@
-[WIP]
\ No newline at end of file
diff --git a/scripts/install_rust.sh b/scripts/install_rust.sh
new file mode 100755
index 0000000000..0a778ac670
--- /dev/null
+++ b/scripts/install_rust.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+echo 'install rust'
+sudo xcode-select -s /Applications/Xcode.app/Contents/Developer
+curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain nightly -y
+echo 'export PATH="$$HOME/.cargo/bin:$$PATH"' >> ~/.bash_profile
+source ~/.bash_profile
\ No newline at end of file
diff --git a/scripts/install_tool.sh b/scripts/install_tool.sh
new file mode 100755
index 0000000000..cde07b2403
--- /dev/null
+++ b/scripts/install_tool.sh
@@ -0,0 +1,15 @@
+#!/bin/sh
+
+#targets
+rustup target add x86_64-apple-darwin
+
+#tools
+echo 'install tools'
+rustup component add rustfmt
+cargo install cargo-expand
+cargo install cargo-watch
+cargo install cargo-cache
+
+#protobuf code gen env
+brew install protobuf@3.13
+cargo install --version 2.20.0 protobuf-codegen
\ No newline at end of file