Answer
According to IMO Resolution A.1155(32) (Procedures for Port State Control), inspections are categorized into four types:
Initial Inspection: The standard boarding. The inspector checks statutory certificates, crew manning, and takes a general walkaround to assess the overall condition of the hull, machinery, and equipment.
More Detailed Inspection: Triggered if the initial inspection reveals "clear grounds" to suspect the ship does not substantially meet convention requirements (e.g., missing certificates, obviously defective equipment, or crew inability to perform a drill). Involves in-depth operational testing.
Expanded Inspection: A mandatory, highly rigorous inspection aimed at specific high-risk vessels based on their age and type (e.g., older bulk carriers, oil tankers, chemical tankers). Requires advance notice and takes considerably more time.
Concentrated Inspection Campaign (CIC): A targeted campaign organized by regional MoUs (like the Tokyo or Paris MoU). For a specific period (usually 3 months), every inspected ship undergoes a specialized checklist focusing on one high-risk area (e.g., Fire Safety, STCW Rest Hours, or Enclosed Space Entry).