Developing a contingency plan and avoiding disruptions from a security breach involves the following steps: 1. Conduct a threat assessment to identify potential risks to the supply chain from security breaches. 2. Identify core business functions and conduct a business impact analysis to understand how disruptions could affect the business. 3. Apply prevention and mitigation measures by researching best practices, utilizing standards for business continuity and supply chain security, implementing supplier oversight and cargo controls, and vetting the supplier base. 4. Implement tests of the contingency plan and maintain the plan to ensure it remains effective over time.