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diff --git a/docs/guide/developer-guide.rst b/docs/guide/developer-guide.rst
index 18182543..b6d4ce88 100644
--- a/docs/guide/developer-guide.rst
+++ b/docs/guide/developer-guide.rst
@@ -2,23 +2,26 @@
.. http://creativecommons.org/licenses/by/4.0
.. Copyright (C) 2020 Nordix Foundation.
+.. _developer_guide:
+
Developer Guide
===============
This document provides a quickstart for developers of the CCSDK ORAN parts.
-A1 Adapter
-++++++++++
+Source tree
++++++++++++
-TBD
+This application provides CCSDK Policy Management Service and A1 Adapter as main functional resources.
+Each resource is implemented independently in a package corresponding to its name.
-The A1 Adapter can be accessed over the REST API. See :ref:`offered_apis` for how to use the API.
+A1 Policy Management Service
+++++++++++++++++++++++++++++
+The CCSDK Policy Management Service (PMS) is a Java 11 web application built over Spring Framework.
+Using Spring Boot dependencies, it runs as a standalone application.
-A1 Policy Management
-++++++++++++++++++++
-
-The CCSDK Policy Management Service (PMS) provides a REST API for management of policices. It provides support for:
+PMS provides a REST API for management of policices. It provides support for:
* Supervision of clients (R-APPs) to eliminate stray policies in case of failure
* Consistency monitoring of the SMO view of policies and the actual situation in the RICs
@@ -31,8 +34,31 @@ The CCSDK Policy Management Service (PMS) provides a REST API for management of
The Policy Management Service can be accessed over the REST API. See :ref:`pms_api` for how to use the API.
+Dependencies
+------------
+This project uses various frameworks which are managed with Maven
+dependency management tool (see *pom.xml* file at root level) :
+
+- Swagger annotations
+- `Spring Framework <https://github.com/spring-projects/spring-boot>`_
+- `Springfox <https://github.com/springfox/springfox>`_ Automated JSON API documentation for API's built with Spring
+- `Immutable <https://immutables.github.io/>`_ to generate simple, safe and consistent value objects
+- `JSON in Java <https://github.com/stleary/JSON-java>`_ to parse JSON documents into Java objects
+- `Apache Commons Net <https://github.com/apache/commons-net>`_ for network utilities and protocol implementations
+- `DCAE SDK <https://github.com/onap/dcaegen2-services-sdk>`_ to get configuration from CBS
+- `Lombok <https://github.com/rzwitserloot/lombok>`_ to generate code, such as getters and setters
+- `Awaitility <https://github.com/awaitility/awaitility>`_ to test asynchronous functionality
+
+Configuration
+-------------
+
+There are two configuration files for PMS, *config/application_configuration.json* and *config/application.yaml*.
+The first one contains configuration of data needed by the application, such as which Near-RT RICs
+that are available. The second contains logging and security configurations.
+
Configuration of certs
----------------------
+
The Policy Management Service uses the default keystore and truststore that are built into the container. The paths and passwords for these stores are located in a yaml file:
oran/a1-policy-management/config/application.yaml
@@ -54,3 +80,10 @@ The target paths in the container should not be modified.
Example docker run command for mounting new files (assuming they are located in the current directory):
`docker run -p 8081:8081 -p 8433:8433 --name=policy-agent-container --network=nonrtric-docker-net --volume "$PWD/new_keystore.jks:/opt/app/policy-agent/etc/cert/keystore.jks" --volume "$PWD/new_truststore.jks:/opt/app/policy-agent/etc/cert/truststore.jks" --volume "$PWD/new_application.yaml:/opt/app/policy-agent/config/application.yaml" o-ran-sc/nonrtric-policy-agent:2.1.0-SNAPSHOT`
+
+A1 Adapter
+++++++++++
+
+TBD
+
+The A1 Adapter can be accessed over the REST API. See :ref:`offered_apis` for how to use the API.