It is our great pleasure to welcome you to the Fifth CoSDEO Workshop in conjunction with the IEEE Intemational Conference on Pe1vasive Computing and Communications (PerCom 2016). This is the first time that the CoSDEO comes to Australia and the first time that it is co-located with PerCom. This year's edition focuses on contact-free ambient sensing, localisation and tracking, extending the successful theme of the fourth CoSDEO workshop on Device-Free Radio-Based Recognition. This years program has selected 6 exciting papers embracing a number of diverse perspectives across the field. Regarding the submission and review process for CoSDEO 2016, each paper was reviewed by at least two to five technical program committee (TPC) members. This year, 6 excellent papers were finally selected for inclusion at the workshop. The topics of the papers reflect the wide spectrum research around mobile computing, se1vices, and applications, ranging from activity recognition, sentiment sensing, advances towards accurate Radio-Tomographic Imaging, Deep-Leaming approaches to RFbased recognition, Audio-based mechanisms, implementations utilising depth-sensors as well as multivariate ambient sensing.