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" This change of scale has led to a new class of problems and challenges discussed throughout this project summary . To illustrate the class of problems and DARPA 's interest in this problem , let us consider a hypothetical example . Reconfiguration facilities are usually restricted to a class of changes and are embedded into the module configuration language . Villanueva , as we have seen , was condemned merely to abjure for light suspicion of heresy and to a few years ' absence from Madrid , but that cast disgrace upon his whole kindred ; he and his descendants fell into the class of pariahs and could form no alliance outside of that caste ; through generations they were branded with an ineffaceable stigma . A bit later , I realized that the way I solved my particular problem represents quite a general approach to a much larger class of problems and hence can be useful to somebody else . While simulations of the strong nuclear force may seem a very esoteric goal , the techniques and underlying mathematics are common to a broad class of problems and are particularly common among exceedingly demanding problems in high-performance computing . Architectural and algorithmic extensions to PE-I are briefly considered : the solution of a wider class of PDEs and the use of more sophisticated algorithms like the multigrid method are some of the issues addressed . Each abstraction layer ( XML and ODBC ) will mask some class of changes and expose others . Rewarding is based on the mere fact of publishing in a certain class of journals and on being referenced in articles by other scholars , both metrics directly derived from the scholarly communication system itself . That is , every system is easy to modify for a certain class of changes and difficult to modify for others , so a statement requiring that a system " shall be modifiable , " as is commonly included in requirements documents , is meaningless .