Big data is an emerging paradigm applied to datasets whose size is beyond the ability of commonly used software tools to capture, manage, and process the data within a tolerable elapsed time. Cloud computing provides the potential storage and processing capability for big data applications. Between them, workflow technology, which composes and automates business and scientific processing tasks, becomes a bridging and enabling tool to utilize cloud infrastructure for big data management. This workshop aims to provide a forum for researchers, practitioners and developers from different background areas such as cloud computing, service computing, data processing, and workflow area to exchange the latest experience, research ideas and synergic research and development on fundamental issues and applications about workflow management in cloud computing and big data environments. The workshop solicits high quality research results in all related areas. WMCB 2014 is the next event in a series of highly successful International Workshops, previously held as WMSC 2013 (Karlsruhe, Germany), WMSC 2012 (Xiangtan, China), WMSC 2011 (Sydney, Australia), WMSC 2010 (Hongkong, China), and WMSC 2009 (Chengdu, China).