is about has effect on Alejandra Gonzalez-Beltran 'has effect on' is a special case of the 'is about' relationship to be used for mixed effect models AGB: this relationship requires more discussion in light of potentially adding the Effect class as per the issue: https://github.com/ISA-tools/stato/issues/75 Thus the definition is temporary. The domain and range were 'variable' but removing now to discuss the specific restrictions when the issue is discussed. Not extracting to separate ontology (stato-experimental.owl) due to IDs already assigned. If deemed not necessary in the future, the IDs should be deprecated. Philippe Rocca-Serra variable requires discussion