Informal Processes are human-centric business processes with unpredictable activities during modeling time. The Informal Process Essentials (IPE) approach aims for modeling informal processes in a resource-centric way so that the desired outcomes of informal process can be reproduced. Entities in IPE approach include organizational goals, capabilities, context, resources, and informal process. They are connected in organizations together. Mobile application is widely used in common business to enhance business process from different aspects like flexibility and efficiency. Whereas support for informal processes using evolving mobile devices has not been investigated yet. In this thesis, requirements for organizational modeling will be investigated and satisfying solution concepts will be presented. As mobile applications have different use case scenarios and criteria compared with desktop applications, we derive the requirements from these use case scenarios and criteria. Hereafter, we propose new concepts, such as notifications and interactions, note list, privilege management, interactive group and interactive participants. To validate our concepts, we provide a case study on a mobile modeling scenario supported by an Android application implementing. Our work introduces four added values compared current modeling approach for informal process, including time-involving definitions, location-independent modeling, interrelated participants and context aware definitions.