An ontology graph model

whi ch creates ontology adjacency matrix and ontology reachability matrix

is descri bed.Depending on matrix shift and calculation

rippleeffect of ontology evolut ion can be analyzed and its quantity can be ascertained.Every rippleeffect cau sed by ontology change operation is described.At the same time

approaches for calculating ontology element contribution

ontology cohesions and effect degree applied to every ontology element during ontology evolution

are provided.Rippl eeffect analysis for dependencyunknown ontology evolution is discussed

and a server model for ontology evolution is also provided.All are credible foundatio n for management

control

usage and evaluation of ontology evolution

and are f oundation for ontology evolution automation calculation in computer.