Variability has proved to be a central concept in different engineering domains to develop solutions that can be easily adapted to different organizational settings and different sets of customers at a low price. The MAP formalism has a high level of variability as it is expressed in an intentional manner through goals and strategies. However, a high level of variability means a high number of variation points. A process customization is then required to offer a better guidance. The Product lines have appeared with this management of variability and customization. Furthermore, we propose the Process line concept to represent the processes that may be customized to a given project. Our goal is to enhance the Map guidance by specifying the MIG (Map Indicator-based Guidance) approach. We suggest several guidance approaches based on an indicators' typology. We illustrate our proposal with an example from the requirement engineering field.