Using Trac for Empirical Data Collection and Analysis in Developing Small and Medium-Sized Enterprise Systems. - Naoki Ohsugi; Kyohei Fushida; Nobuto Inoguchi; Hiroyuki Arai; Hiroyuki Yamanaka; Takashi Niwa; Misa Fujinuki; Motohisa Tomura; Tuyoshi Kitani (ESEM, 2015)