Episode Summary 

Even when a refrigerator display reads exactly 5°C, the temperature inside can vary dramatically from corner to corner. Heat rises, cold air falls, and every time a door opens, the environment shifts. Temperature mapping aims to replace assumptions with scientific evidence by measuring and documenting temperatures throughout a controlled space over time to demonstrate that it is genuinely suitable for its intended purpose.

In this episode of Measuring Up: Thinking Out Loud, host Bill White sits down with Nathan Roman to walk through the full process: where mapping applies, how calibrated sensors are placed in structured grids, what FDA, USP, WHO, and ISPE guidance actually demands, and the best practices that separate a defensible study from a paperwork exercise. Nathan also covers the most common mistakes organizations make and explains how mapping data directly improves monitoring placement, SOPs, and alarm strategy.

About the Guest 

Nathan Roman is a validation and compliance leader with over 25 years of experience in the pharmaceutical and biotech industries. He specializes in helping companies prove that their systems are fit for purpose and audit-ready via commissioning, qualification, and temperature mapping. 

He has supported major organizations, including AstraZeneca, Merck, and Lonza, and contributed to industry guidance with ISPE on controlled-temperature chamber mapping.

Nathan is the founder of Validation Management Solutions, where he helps teams implement practical, risk-based validation programs that hold up under real-world pressure, and is the author of Six Steps to Effective Temperature Mapping, a practical guide on approaching validation with structure, clarity, and confidence.

To follow his latest industry insights, connect with Nathan on LinkedIn, or visit ValidationMS.com to explore his consultative and training services.