@startuml
skinparam monochrome true
skinparam packageStyle rectangle
skinparam shadowing false

title System Sequence Diagram (SSD) - Alternative One

autonumber

actor "Human Resources \n Manager" as Employee
participant ":System" as System

activate Employee

    Employee -> System : asks to add skills to a collaborator
    activate System

        System --> Employee : shows list of collaborators
    deactivate System

    Employee -> System : chooses collaborator
    activate System

        System --> Employee : shows skills to add to collaborator
    deactivate System

    Employee -> System : chooses skills from list to add
    activate System

        System --> Employee : shows all skills to be appointed and requests confirmation
    deactivate System

    Employee -> System : confirms skills
    activate System

        System --> Employee : displays operation success
    deactivate System

@enduml