In Pega Platform case design:

• Collect Information steps create an assignment for a user to input data into a form, matching the action where a user enters reservation details.
• Approval steps are specific assignments routed to a supervisor (manager) to explicitly accept or reject a case, matching the timesheet review scenario.
• Decision steps are automated processes where the system evaluates logic or conditions (such as checking a request type) to determine which path the workflow should take next.
• Automation steps perform system-side actions without human intervention, such as sending correspondence (emails) or updating databases.

Pega Documentation: Configuring the Case Lifecycles. "Collect information... Assigns a task... to a user... to collect users' personal details." / "Approve/Reject... Assigns a task to a user, typically a manager... to approve or reject the Case." / "Decision... Evaluates an Expression... to determine which Step is next." / "Automation... Provides preconfigured functionality, such as sending an email..." (Source 1.4)

Pega Academy: Designing a Case Life Cycle. "Collect information Steps are Steps that require user action or input." / "Automation Steps are steps performed by the system... send emails..." (Source 1.1, 1.2)

Pega Academy: Work approval. "Case approvals are decision points at which one or more users decide whether to approve or reject a case." (Source 2.1)