In this chapter, the authors main work is to propose a development process of pervasive work-based learning systems from design to execution based on an activity-oriented approach. The authors focus especially on pervasive TEL (technology-enhanced learning) systems in learning situations at the workplace. They introduce a context-aware scenario model of corporate learning and working activities in e-retail environments such as shops and hypermarkets. This model integrates contextual information into scenarios and select how to perform activities according to the current situation. In order to execute their scenario, they outline the semantic description of learning components (resources, services and activities) to enable their selection to achieve the goals specified for learning and working activities. Thus, an adaptive mechanism enables the selection of the relevant learning components for the current situation. This can be solved thanks to a service oriented architecture that consists of an infrastructure for service management and execution in e-retail environments.