The self-inspection process in the "Three-Inspection System" involves workers inspecting their own products to ensure quality standards are met. 

Specifically: Self-inspection refers to producers conducting inspections of their products based on technical standards specified in drawings, processes, or contracts, and making judgments on whether the products are qualified or not. 

This is part of the "Three-Inspection System" (self-inspection, mutual inspection, and professional inspection), aimed at preventing defective products from entering the next production process through proactive worker checks.