These concepts have largely been derived through the analysis of systems designed by researchers in the CSCW community, or through studies of existing systems (for example, Wikipedia). CSCW researchers that design and build systems try to address core concepts in novel ways. However, the complexity of the domain makes it difficult to produce conclusive results; the success of CSCW systems is often so contingent on the peculiarities of the social context that it is hard to generalize. Consequently, CSCW systems that are based on the design of successful ones may fail to be appropriated in other seemingly similar contexts for a variety of reasons that are nearly impossible to identify "a priori". CSCW researcher Mark Ackerman calls this "divide between what we know we must support socially and what we can support technically" the socio-technical gap and describes CSCW's main research agenda to be "exploring, understanding, and hopefully ameliorating" this gap.