diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 74a2048915..4cddc482a9 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -2,6 +2,16 @@
 
 Thanks for your interest in this project.
 
+# Table of Contents
+1. [Project description](#project-description)
+2. [Developer resources](#developer-resources)
+3. [Eclipse Development Process](#eclipse-development-process)
+4. [Eclipse Contributor Agreement](#eclipse-contributor-agreement)
+5. [General contribution to the project](#general-contribution-to-the-project)
+6. [Contributing as a Consultant](#contributing-as-a-consultant)
+7. [Contributing as a Developer](#contributing-as-a-developer)
+9. [Contact](#contact)
+
 ## Project description
 
 The companies involved want to increase the automotive industry's
@@ -53,7 +63,7 @@ fulfills the DCO's requirement that you sign-off on your contributions.
 For more information, please see the Eclipse Committer Handbook:
 https://www.eclipse.org/projects/handbook/#resources-commit
 
-# Eclipse Dependency License Check
+## Eclipse Dependency License Check
 
 In case of new dependencies or version updates, it might be necessary to have the new library checked and accepted by the Eclipse foundation. Do create new tickets for this, you can use this command:
 ```
@@ -62,6 +72,45 @@ mvn org.eclipse.dash:license-tool-plugin:license-check -Ddash.iplab.token=$ECLIP
 
 For more information on the tool and how to acquire the token, check https://github.com/eclipse/dash-licenses.
 
+## General contribution to the project
+
+
+## Contributing as a Consultant
+
+### Conceptual work and specification guidelines
+1. The prerequisite for a concept is always a github issue that defines the business value and the acceptance criteria that are to be implemented with the concept
+2. Copy and rename directory /docs/#000-concept-name-template /docs/#<DDD>-<target-name>
+3. Copy file /docs/Concept_TEMPLATE.md into new directory  /docs/#<DDD>-<target-name>
+
+### Diagrams
+PlantUML and Mermaid is used for conceptual work.
+https://mermaid.js.org/
+https://plantuml.com/
+
+
+#### PlantUML 
+default skinparam for plantUml diagrams 
+````
+@startuml
+skinparam monochrome true
+skinparam shadowing false
+skinparam linetype ortho
+skinparam defaultFontName "Architects daughter"
+autonumber "<b>[000]"
+
+@enduml
+````
+
+####  Mermaid
+Default header for mermaid sequence diagrams
+````
+sequenceDiagram
+    %%{init: {'theme': 'dark', 'themeVariables': { 'fontSize': '15px'}}}%%
+    autonumber
+ ````   
+
+## Contributing as a Developer
+
 ### Commit messages
 The commit messages have to match a pattern in the form of:  
 ``< type >(scope):[<Ticket_ID>] < description >``  
@@ -80,11 +129,13 @@ cp local/development/commit-msg .git/hooks/commit-msg && chmod 500 .git/hooks/co
 
 For further information please see https://github.com/hazcod/semantic-commit-hook
 
-## Code formatting 
+### Code formatting 
 Please use the following code formatter: [.idea/codeStyles](.idea/codeStyles)
 
+
 ## Contact
 
 Contact the project developers via the project's "dev" list.
 
 * https://accounts.eclipse.org/mailing-list/tractusx-dev
+* Eclipse Matrix Chat https://chat.eclipse.org/#/room/#tractusx-irs:matrix.eclipse.org