diff --git a/robot-systest/lib/ns_lib.robot b/robot-systest/lib/ns_lib.robot
index cc252fb..4be7fe4 100644
--- a/robot-systest/lib/ns_lib.robot
+++ b/robot-systest/lib/ns_lib.robot
@@ -16,6 +16,11 @@
 ${ns_launch_pol_time}   30sec
 ${ns_delete_max_wait_time}   1min
 ${ns_delete_pol_time}   15sec
+${ns_action_max_wait_time}   1min
+${ns_action_pol_time}   15sec
+${vnf_scale_max_wait_time}   5min
+${vnf_scale_pol_time}   30sec
+
 
 *** Keywords ***
 Create Network Service
@@ -80,3 +85,88 @@
     Should Be Equal As Integers   ${rc}   ${success_return_code}
 
     WAIT UNTIL KEYWORD SUCCEEDS  ${ns_delete_max_wait_time}   ${ns_delete_pol_time}   Check For NS Instance To Be Deleted   ${ns}
+
+Execute NS Action
+    [Documentation]     Execute an action over the desired NS.
+    ...                 Parameters are given to this function in key=value format (one argument per key/value pair).
+    ...                 Return the ID of the operation associated to the executed action.
+    ...                 Examples of execution:
+    ...                     \${ns_op_id}=  Execute NS Action  \${ns_name}  \${ns_action}  \${vnf_member_index}
+    ...                     \${ns_op_id}=  Execute NS Action  \${ns_name}  \${ns_action}  \${vnf_member_index}  \${param1}=\${value1}  \${param2}=\${value2}
+
+    [Arguments]  ${ns_name}  ${ns_action}  ${vnf_member_index}  @{action_params}
+
+    ${params}=  Set Variable  ${EMPTY}
+    FOR  ${param}  IN  @{action_params}
+        ${match}  ${param_name}  ${param_value} =  Should Match Regexp  ${param}  (.+)=(.+)  msg=Syntax error in parameters
+        ${params}=  Catenate  SEPARATOR=  ${params}  "${param_name}":"${param_value}",
+    END
+    ${osm_ns_action_command}=  Set Variable  osm ns-action --action_name ${ns_action} --vnf_name ${vnf_member_index}
+    ${osm_ns_action_command}=  Run Keyword If  '${params}'!='${EMPTY}'  Catenate  ${osm_ns_action_command}  --params '{${params}}'
+    ...  ELSE  Set Variable  ${osm_ns_action_command}
+    ${osm_ns_action_command}=  Catenate  ${osm_ns_action_command}  ${ns_name}
+    ${rc}  ${stdout}=  Run and Return RC and Output  ${osm_ns_action_command}
+    Should Be Equal As Integers  ${rc}  ${success_return_code}  msg=${stdout}  values=False
+    Wait Until Keyword Succeeds  ${ns_action_max_wait_time}  ${ns_action_pol_time}  Check For NS Operation Completed  ${stdout}
+    [Return]  ${stdout}
+
+
+Execute Manual VNF Scale
+    [Documentation]     Execute a manual VNF Scale action.
+    ...                 The parameter 'scale_type' must be SCALE_IN or SCALE_OUT.
+    ...                 Return the ID of the operation associated to the executed scale action.
+
+    [Arguments]  ${ns_name}  ${vnf_member_index}  ${scaling_group}  ${scale_type}
+
+    Should Contain Any  ${scale_type}  SCALE_IN  SCALE_OUT  msg=Unknown scale type: ${scale_type}  values=False
+    ${osm_vnf_scale_command}=  Set Variable  osm vnf-scale --scaling-group ${scaling_group}
+    ${osm_vnf_scale_command}=  Run Keyword If  '${scale_type}'=='SCALE_IN'  Catenate  ${osm_vnf_scale_command}  --scale-in
+    ...  ELSE  Catenate  ${osm_vnf_scale_command}  --scale-out
+    ${osm_vnf_scale_command}=  Catenate  ${osm_vnf_scale_command}  ${ns_name}  ${vnf_member_index}
+    ${rc}  ${stdout}=  Run and Return RC and Output  ${osm_vnf_scale_command}
+    Should Be Equal As Integers  ${rc}  ${success_return_code}  msg=${stdout}  values=False
+    Wait Until Keyword Succeeds  ${ns_action_max_wait_time}  ${ns_action_pol_time}  Check For NS Operation Completed  ${stdout}
+    [Return]  ${stdout}
+
+
+Get Operations List
+    [Arguments]  ${ns_name}
+
+    ${rc}  ${stdout}=  Run and Return RC and Output  osm ns-op-list ${ns_name}
+    log  ${stdout}
+    log  ${rc}
+    Should Be Equal As Integers  ${rc}  ${success_return_code}
+
+
+Check For NS Operation Completed
+    [Documentation]     Check wheter the status of the desired operation is "COMPLETED" or not.
+
+    [Arguments]  ${ns_operation_id}
+
+    ${rc}  ${stdout}=  Run and Return RC and Output  osm ns-op-show ${ns_operation_id} --literal | yq r - operationState
+    log  ${stdout}
+    Should Be Equal As Integers  ${rc}  ${success_return_code}
+    Should Contain  ${stdout}  COMPLETED  msg=Timeout waiting for ns-action with id ${ns_operation_id}  values=False
+
+
+Get Ns Vnfr Ids
+    [Documentation]     Return a list with the IDs of the VNF records of a NS instance.
+
+    [Arguments]  ${ns_id}
+
+    ${rc}  ${stdout}=  Run and Return RC and Output  osm vnf-list | grep ${ns_id} | awk '{print $2}' 2>&1
+    Should Be Equal As Integers  ${rc}  ${success_return_code}  msg=${stdout}  values=False
+    @{vdur} =  Split String  ${stdout}
+    [Return]  @{vdur}
+
+
+Get Vnf Vdur Names
+    [Documentation]     Return a list with the names of the VDU records of a VNF instance.
+
+    [Arguments]  ${vnf_id}
+
+    ${rc}  ${stdout}=  Run and Return RC and Output  osm vnf-show ${vnf_id} --literal | yq r - vdur.*.name
+    Should Be Equal As Integers  ${rc}  ${success_return_code}  msg=${stdout}  values=False
+    @{vdur} =  Split String  ${stdout}
+    [Return]  @{vdur}
+