This Technical Specification establishes principles and describes methods for the measurement of dermal exposure in workplaces. It gives guidance on the commonly used approaches to the measurement of dermal exposure, their advantages and limitations and how these might be assessed in specific circumstances for specific compounds.This Technical Specification should enable users of dermal sampling methods to adopt a consistent approach to method validation and provide a framework for the assessment of method performance. This Technical Specification describes the requirements against which sampling methods need to be assessed. It will then indicate methods for agreement with these requirements. Requirements include specification of the following:NOTENot all requirements are applicable to all methods.-sampling efficiency;-recovery efficiency;-sample stability;-maximum capacity;-bias, precision, overall uncertainty;-core information;-contextual information.