Business process modeling must offer a trustworthy, reliable and updated representation of different enterprise concerns. Nonetheless, it is acknowledged that model maintenance is a difficult task and most of the times modeling efforts in companies are limited to specific projects occurring at a particular time. After that, models just “sit on the shelf”. This paper defines an “as-is” model continuous updating process that uses the annotation mechanism to create interaction contexts enabling business actors (1) to communicate and explicit their knowledge about processes and about their own work, and (2) to discuss existing process representations. To support the as-is model updating process in real organizational environment a prototype tool has been developed. This approach has demonstrated that organizational actors, since provided with a process and supporting tool, can act as active updaters of business process models by comparing the modeled with actually executed activities, becoming themselves organizational modelers.