title: A review of human factors challenges of complex adaptive systems: discovering and understanding chaos in human performance.
abstract: OBJECTIVE
  In this paper, the author explores a need for a greater understanding of the true nature of human-system interactions from the perspective of the theory of complex adaptive systems, including the essence of complexity, emergent properties of system behavior, nonlinear systems dynamics, and deterministic chaos.
  
  
  BACKGROUND
  Human performance, more often than not, constitutes complex adaptive phenomena with emergent properties that exhibit nonlinear dynamical (chaotic) behaviors.
  
  
  METHODS
  The complexity challenges in the design and management of contemporary work systems, including service systems, are explored. Examples of selected applications of the concepts of nonlinear dynamics to the study of human physical performance are provided.
  
  
  RESULTS
  Understanding and applications of the concepts of theory of complex adaptive and dynamical systems should significantly improve the effectiveness of human-centered design efforts of a large system of systems.
  
  
  CONCLUSIONS
  Performance of many contemporary work systems and environments may be sensitive to the initial conditions and may exhibit dynamic nonlinear properties and chaotic system behaviors. Human-centered design of emergent human-system interactions requires application of the theories of nonlinear dynamics and complex adaptive system.
  
  
  CONCLUSIONS
  The success of future human-systems integration efforts requires the fusion of paradigms, knowledge, design principles, and methodologies of human factors and ergonomics with those of the science of complex adaptive systems as well as modern systems engineering.
authors: Department of Industrial Engineering and Management Systems, University of Central Florida, 4000 Central Florida Blvd., P.O. Box 162993, Orlando, FL 32816-2993, USA. wkar@ucf.edu
authors: Waldemar
authors: W
authors: Karwowski
mesh_terms: D004576:Electromyography; D006804:Ergonomics; D006801:Humans; D017711:Nonlinear Dynamics; D016272:Occupational Health; D017751:Safety Management; D013647:Task Performance and Analysis; D014584:User-Computer Interface