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diff --git a/doc/service_design/catalogs.md b/doc/service_design/catalogs.md
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--- a/doc/service_design/catalogs.md
+++ b/doc/service_design/catalogs.md
@@ -35,18 +35,40 @@ or a more complex example (beautify it first if you want to view it, but in the
You can leave the Alias and Unit of Measure as is. Check also the is Default.
+### OSM NS LCM Status
+When a Service is deployed, OpenSlice provides the ability to see the status messages from the NFVO. This status can be regarding NS instantiation, primitive execution, etc.
+
+Going to `ResourceFacingService (RFS)` -> `Contextual Features` -> `MANO NSLCM`, you will be able to see a beautified view of the status messages retrieved by OSM.
+
+
### Day 2 Primitive Actions
-NFVOs like OSM allow to perform actions while a service is running, for example change attributes or make actions on a specific VNF. To design this do something similar to the following example:
+NFVOs like OSM allow to perform actions while a service is running, for example change attributes or make actions on a specific VNF.
+OpenSlice supports the invocation of day 2 primitives using Open Source MANO (OSM). This feature allows users to perform various actions while a service is running, such as changing attributes or executing specific actions on a Network Service's (NSD) Virtual Network Function (VNF). This capability enhances the flexibility and control over network services, making it easier to manage them in real-time.
+
+#### Invoking Primitives in OpenSlice
+
+To design and invoke primitives in OpenSlice, do the following steps:
+
+1. When a service is instantiated, go to its `ResourceFacingService (RFS)` -> `Contextual Features` -> `MANO Primitives List`;
+ 
+
+2. There, you will find that VNF available primitives;
+3. Click on the `Execute Primitive` button of the chosen VNF;
+4. On the `Execute MANO Primitives` window:
+ 1. Select the desired primitive on the `Primitive Parameter Name`;
+ 2. Provide the `Primitive Parameter Value`;
+
+ 
+
+5. Click on the `Submit` button.
-- Go to the RFS related to the NSD that contains VNFs with primitives
-- create a characteristic named Primitive:: , e.g. Primitive::touch
-- select Value Type: ARRAY
-- add Service Characteristic Value: i) alias=primitive, value= (e.g. touch), ii) alias=member_vnf_index, value= (e.g. 1), iii) add the params that the user will change in alias the name of param and in value an initial value (e.g. alias=filename, value=myfile.txt)
+After the previous steps, after a while, you should be able to see the status of the primitive execution above on the same page, on the `MANO NSLCM` section.
-In the above example, when the service is running and the user goes to service inventory to MODIFY it, changes the value of the alias=filename, value=myfile.txt, to value =secondfile.txt. Then inside the VNF a file will be created called secondfile.txt
+> ***IMPORTANT NOTE:***
+As of now, OpenSlice still only supports the invoking of VNF-level primitives. We expect to have VDU-level primitives in the future.