In multinational corporations, new models of learning are developing. A particular model with direct applications for challenges facing distributed workforces is one that combines the strengths of formal and informal learning while focusing on participants' work-based tasks. An operationalisation of this model in the context of the ongoing professional development of the engineers, geologists, and other technical specialists in a multinational oil company (Shell EP) is described. Important for the quality control and continual improvement of the implementation of the model is a set of criteria for the design and evaluation of courses reflecting its work-based learning approach. "Merrill's First Principles of Instruction" (2002) form a starting point for such a model, but need to be expanded to reflect the particular needs of the Shell EP context. This article presents the expansion of Merrill's First Principles as the "Merrill+ design and evaluation criteria" for courses with work-based activities for technical professionals and demonstrates how the criteria can be applied through a selection of some results of evaluations of more than 60 of the Shell EP courses using a course-scan methodology based on the Merrill+ criteria. Implications of use of the Merrill+ criteria for design and evaluation are discussed.