A parameter restricting an acceptable range of changing (new) values according to a change description. The value region must be the q-location of the same physical quality of the changed value range in the same description. 2 A dependency between two change descriptions. 2 A description of a changing event, according to some sequence (a course) and parameters. A parameter restricting an acceptable range of changed (old) values according to a change description. The value region must be the q-location of the same physical quality of the changing value range in the same description. A change dependence that has as proper part at least one of the following change dependencies: i) any diachronic dependence ii) any indirect diachronic dependence iii) any transitive application of a diachronic or indirect diachronic dependence 2 A diachronic dependence between two basic quality changes that are synchronically depend-ons of two other quality changes. 2 2 2 A complex course of events that classifies a change event. 1 1 A basic quality change is a situation capturing the change of a physical endurant along just one aspect/quality type. Complex situations are decomposed into quality changes by fixing: i) one specific participant, ii) one physical quality type along which the participant changes, iii) two perdurants sequenced by a successor relation, and iv) two different physical regions that represent the quality type across the two perdurants. For example, a change of color, or shape. In OWL-DL, the complex axiomatization is rendered in pieces (and OWL-DL does not allow to coreference the entities mentioned in the pieces): a) BQC has one unique participant with some quality b) BQC has (at least) two perdurants that share the same participant c) the sequence of those perdurants is provided by a change course in a change description d) the regions of that quality differ across the perdurants, according to the parameters (changed and changing value ranges) defined in a change description. 2 Basic quality changes can be atomic when no proper part of it is a basic quality change for the same participant. A generic change of one or more physical qualities across different regions. 2 A concurrent dependency between two change descriptions, involving a same participant. 2 1 The structural dependence between two basic quality changes sharing a unique participant. It must hold for all physical endurants. It requires temporal coincidence. It also assumes a synchronic dependence between the types of those quality changes (change descriptions). The dependence between two basic quality changes not sharing a unique participant. It does not require temporal coincidence. It also assumes either a backward or forward dependence between the types of those quality changes (change descriptions). A generic existential dependence between two types of basic quality changes (change descriptions). The first BQC precedes the second. The dependence between two basic quality changes not sharing a unique participant. It does not require temporal coincidence. It also assumes either a backward or forward dependence between the types of those quality changes (change descriptions). A generic dependency relation that does not require the temporal inclusion of the entities for which the relation holds. A generic existential dependence between two types of basic quality changes (change descriptions). The first BQC follows the second. An event having only one (constant) participant.