Educational researchers use observations to collect information about classroom activities as they occur. Currently the most prevalent methods of logging classroom observations are pen-and-paper or video recording. The former is inefficient, especially in large classes while the latter requires expensive infrastructure. In this paper we propose the design framework for the development of a software application for protocol-based multi-observer data logging and analysis called PULSE. Following design-based research we developed the four aspects of this framework. They were iteratively improved over the research cycles based on the feedback of the previous cycles. In this work-in progress paper, we present an ongoing design prototype of the application.