Equipment maintenance A method for performing periodic upkeep or servicing of field or laboratory equipment. Maintenance may be performed in the field, in a laboratory, or at a factory maintenance center. Equipment ODM2 MethodType Controlled Vocabulary ODM2 Working Group A vocabulary for describing types of Methods associated with creating observations. MethodTypes correspond with ActionTypes in ODM2. An Action must be performed using an appropriate MethodType - e.g., a specimen collection Action should be associated with a specimen collection method.