In Episode 9 of my Configuration Management series, I break down NIST SP 800-53 Rev. 5 CM-9: the Configuration Management Plan (CMP). I explain CM-9 in plain terms—this is where you document how configuration management activities are performed across the system life cycle, including configuration identification, change control, and configuration status accounting. I also call out that CM-9 is selected for the Moderate and High baselines (not Low), and why that matters when you’re building out your compliance package. I walk through the actual CM-9 requirement: develop, document, and implement the CMP; define roles and responsibilities; establish a process for identifying configuration items throughout the SDLC; define and place those items under configuration management; get the plan reviewed and approved by the right personnel/roles; and protect the plan from unauthorized disclosure and modification. Then I cover the “everyday English” discussion—how CM happens both in development (code, libraries) and operations (installed components and configurations), and how orgs often use templates to keep plans consistent. Finally, I share a practical assessment approach: examine CM policies/procedures and the SSP, interview the stakeholders responsible, and review the CMP sections for roles, configuration items, how items are identified across the SDLC, and—very importantly—evidence of updates and review frequency. The big takeaway is simple: a solid CM-9 program reduces unauthorized/incorrect changes and improves security, reliability, and operational efficiency.