Classification of concrete objects

I wrote for 2 hours today.

According to Bunge's ontology, classes are a way to group things (concrete objects). To be a class, things must have a common property. Because a property is a observer independent, subject to scrutiny, etc., the function of an thing cannot be used for classification. Function is either a use to which an individual puts an item (single-person function) or if it is generally used in a way by society, it could have a socially accepted function. Is a Louisville Slugger sports equipment, a weapon, or fuel?