The structured description of mutant phenotypespresentsamajorconceptualandpractical problem. A general model for generating mouse phenotype ontologies that involvescombing avarietyofdifferentontologies tobetterlinkanddescribephenotypesispresented.This model isbasedon thePhenotypeandTraitOntologyschema proposal and incorporates practicallimitations and designing solutions in an attempt to modelatestbedforthefirst phenotypeontologyconstructedinthismanner,namelythemousebehaviorphenotype ontology.We proposetheapplicationofsuch amodelcouldprovidecuratorswitha powerfulmechanismofannotation,miningandknowledgerepresentationaswellas achieving some level of free text disassociation.