diff --git a/use-cases/src/site/sphinx/_static/imgs/step_execution.png b/use-cases/src/site/sphinx/_static/imgs/step_execution.png
new file mode 100644
index 0000000..244800f
Binary files /dev/null and b/use-cases/src/site/sphinx/_static/imgs/step_execution.png differ
diff --git a/use-cases/src/site/sphinx/_static/plugins_table.rst b/use-cases/src/site/sphinx/_static/plugins_table.rst
new file mode 100644
index 0000000..fa786bc
--- /dev/null
+++ b/use-cases/src/site/sphinx/_static/plugins_table.rst
@@ -0,0 +1,9 @@
++---------------------------+------------------+----------------------+-------------------------------------------------------------------+------------------+
+| id                        | type             | label                | description                                                       | version          |
++===========================+==================+======================+===================================================================+==================+
+| SDI-Indexer-Plugin        | Indexer          | null                 | SDI Indexer. Manage Centroids layers.                             | 1.0.0            |
+| [object Object]           | [object Object]  | DEFAULT-3PHASE       | LifecycleManagement                                               | Default 3-Phase  | Default 3-phase lifecycle manager. This plugin supports a simple moderated publication lifecycle.  | 1.0.0  |
+| SDI-Default-Materializer  | Materializer     | null                 | SDI Materializer. This plugin materialize FileSets in gCube SDI.  | 1.0.0            |
+| [object Object]           | [object Object]  | DEFAULT-SINGLE-STEP  | LifecycleManagement                                               | null             | null                                                                                               | null   |
+| [object Object]           | [object Object]  | GNA-CONCESSIONI-LC   | LifecycleManagement                                               | Default 3-Phase  | GNA Concessioni. This plugin supports custom lifecycle management for the GNA Concessioni UseCase. | 1.0.0  |
++---------------------------+------------------+----------------------+-------------------------------------------------------------------+------------------+----------------------------------------------------------------------------------------------------+--------+
diff --git a/use-cases/src/site/sphinx/lifecycle.rst b/use-cases/src/site/sphinx/lifecycle.rst
index 6f30bf8..01fa8b6 100644
--- a/use-cases/src/site/sphinx/lifecycle.rst
+++ b/use-cases/src/site/sphinx/lifecycle.rst
@@ -39,8 +39,6 @@ The suite comes with a pre-built set of implemented lifecycles with their STEPS,
 
 TBD : steps phases, involved events
 
-
-
 ====================
 3 - Phases Lifecycle
 ====================
@@ -121,4 +119,11 @@ The method **perform STEP** allows for the execution of the configured STEPs by
 - STEP ID : must be supported by the configured lifecycle
 - options [optional]: a JSON document with all expected parameters for the execution of the specified STEP
 
-.. note:: Outcome of STEPS and operations is reported in :ref`lifecycle` section of the project.
\ No newline at end of file
+.. note:: Outcome of STEPS and operations is reported in :ref`lifecycle` section of the project.
+
+Steps execution may trigger EVENTS and sometimes other automatic STEPS. The following represents how this behaviour is implemented.
+
+
+.. figure:: _static/imgs/step_execution.png
+   :alt: Locking and cascade execution of triggered operations
+
diff --git a/use-cases/src/site/sphinx/plugins.rst b/use-cases/src/site/sphinx/plugins.rst
index 7ce7941..5ad72cf 100644
--- a/use-cases/src/site/sphinx/plugins.rst
+++ b/use-cases/src/site/sphinx/plugins.rst
@@ -3,4 +3,71 @@
 ###############
 Plugins
 ###############
-**Plugins** implements the
\ No newline at end of file
+**Plugins** implements the very logic of projects lifecycles in a modular way, allowing for composition and configuration of complex :doc:`ucd`.
+
+.. note:: Each plugin exposes their descriptor through the service API in order to check its capabilities. Table below summarize that.
+
+.. include:: _static/plugins_table.rst
+
+
+******************
+Lifecycle Managers
+******************
+These plugins enable the execution of workflows, triggering all other involved plugins.
+
+==================
+2 PHASE Lifecycle plugin
+==================
+2 phase
+
+
+==================
+3 PHASE Lifecycle plugin
+==================
+2 phase
+
+*********************
+Manifestation Plugins
+*********************
+These plugins are expected to enhance :ref:`filesets` with related :ref:`manifestations` for specific consumption.
+Side effects vary depending on involved logic and engines.
+
+==================
+Default SDI Materializer
+==================
+default
+
+==================
+Image previewer
+==================
+default
+
+
+*********************
+Indexer Plugins
+*********************
+These plugins are expected to update :ref:`references` section of the project, registering it to catalogues / indexes.
+Side effects vary depending on involved logic.
+
+
+==================
+Centroids Plugin
+==================
+default
+
+
+
+*****
+GUIs
+*****
+These plugins are designed in order to facilitate users to produce / consume projects.
+
+==================
+Data Entry & management
+==================
+default
+
+==================
+Projects explorer
+==================
+default
\ No newline at end of file