People living in low-resource settings at the base of the world income pyra-mid (i.e. Base of the Pyramid — BOP) face several constraints. To satisfy their unmet needs, integrated frugal innovations are necessary. Several studies, discussed using many names such as ‘design for Base of the Pyramid’, ‘design for development’, ‘prod-uct service systems’, ‘frugal innovations’, ‘humanitarian engineering’, ‘appropriate technology’, etc., have explored the design of such integrated frugal innovations for the BOP. Based on ten key design aspects, gleaned from such studies, this paper aims at developing an Integrated Design Methodology for designing frugal innovations for the BOP (Frugal-IDeM). We have related the key design aspects with the various phases in the design and development process. The Frugal-IDeM also includes recommendations for how to implement the key design aspects.