The document details a nursing care plan for a patient named Mr. Chandan Biswas, using Orem's self-care deficit theory to address his postoperative needs following surgery for peptic perforation with peritonitis. It outlines his condition, the self-care requisites, nursing diagnoses, and the implementation of a supportive education system to enhance his recovery and self-management. The evaluation of the theory’s application underscored the effectiveness of the care plan in improving the patient's autonomy and health outcomes.