With a field so broad in both breadth and depth as that making up the 
    contemporary study of complex systems, it is well nigh impossible to 
    cover all the bases underlying the development of well argued, robust and 
    relevant understanding of these systems. That is one of the reasons why the 
    international journal Emergence: Complexity and Organization has offered 
    a Classical Paper in each issue. Now, in this current volume we have made 
    available in one publication venue the diverse Classical Paper that have 
    been published so far in E:CO. These papers are offered not only to enrich 
    our current understandings by exhibiting the historical background to many 
    of today’s leading complexity-based ideas, perspectives, and methods. They 
    are also gathered here to help address some of the difficulties confronting 
    not only complexity thinkers, but for that matter any thinker sincerely 
    trying to grasp the novel situations and novel difficulties we face in modern times.