At the fundamental awareness level, users are expected to understand what Slack is and its purpose. They should be able to recognize the Slack interface and know how to download and install the application on their device.

Novice users should be able to perform basic operations in Slack such as creating a new workspace, joining an existing one, setting up their profile, and sending direct messages. They should also be able to create channels, invite members to a channel, use basic text formatting, react to messages with emojis, and use @mentions.

Intermediate users should be proficient in using advanced text formatting, uploading and sharing files, using search effectively, and customizing notifications. They should also be comfortable using threads for conversations, pinning important messages, using Slack on mobile devices, and integrating with other apps like Google Drive or Trello.

Advanced users should be adept at using keyboard shortcuts, creating user groups, managing channel settings and permissions, and using Slack calls for voice and video communication. They should also be able to set reminders, use slash commands, and create and manage workflows.

Expert users should have mastery over using advanced search modifiers, customizing Slack with CSS, building custom integrations, and using the Slack API. They should also be capable of troubleshooting common issues, training others to use Slack effectively, and implementing company-wide Slack usage policies.