\input zb-basic \input zb-ioport \iteman{io-port 05978429} \itemau{Cheung, Bob H.L.; Chiu, Dickson K.W.; Hu, Haiyang; Zhuang, Yi; Hu, Hua} \itemti{Alert-based hiker status system.} \itemso{Chiu, Dickson K. W. (ed.) et al., Web information systems engineering -- WISE 2010 workshops. WISE 2010 international symposium WISS, and international workshops CISE, MBC, Hong Kong, China, December 12--14, 2010. Revised selected papers. Berlin: Springer (ISBN 978-3-642-24395-0/pbk). Lecture Notes in Computer Science 6724, 494-504 (2011).} \itemab Summary: Hiking is a popular and healthy outdoor activity but it contains potential risks. Accidents will inevitably occur due to bad weather, sudden personal health problems, and other unexpected events. Timely rescue is particularly difficult for locating the victim in rural areas and often such delay may cause fatal incidents. In order to avoid hiking accidents and promote hiking, we propose a Hiker Status System (HSS) by tracking the current locations of hikers based on Global Position System (GPS). Once they have registered to the system, relevant hiking information can be provided to the relevant users. Moreover, it acts as a social communication platform among hikers. We illustrate the application of a unified alert mechanism for the engineering of our HSS. The Alert Level Identifier module analyzes the hikers' location information to determine potential risks and the alert level so that appropriate parties can be timely informed for handling actions. \itemrv{~} \itemcc{} \itemut{user tracking; emergency response systems; alert management} \itemli{doi:10.1007/978-3-642-24396-7\_40} \end