In this paper, we propose a new spontaneous speech collection method and a methodology for rapid test-andmodify development of mixed initiative spoken dialogue systems. Our method uses VoiceXML environment for helping WOZ experiments and uses tool suite for analyzing the users utterance and for giving feedback to the systems. The core techniques of our method are (1) bootstrapping by Web application framework, (2) WOZ data collection using VoiceXML platform and (3) log analyzing tools for feedback.