Implementation of NASA's flexible path for space exploration will require significant planning and technology development in the functional area of Environmental Control and Life Support (ECLS). A study by engineers at Boeing and HSSSI last year identified viable ECLS technologies to support future human space exploration and developed key tenets for flexible path ECLS systems -reliability, scalability, commonality and maintainability. Continuing this effort, study results have been reassessed based on evolving mission concepts, design parameters and published results of other related studies. They have been extended to include greater specificity in trade parameters as a foundation for technology development planning. The effort has emphasized the development challenges and needs for common technologies and development paths that cut across multiple missions and multipleplatforms used in their execution. The results identified specific high priority development targets for several ECLS functions. These needs are compared to known current development activities and plans and recommendations for added or modified development for future years (2014 and beyond) are discussed.