A class also inherits slot specifiers from its superclasses, so the set of slots actually present in any object is the union of all the slots specified in a class’s **DEFCLASS** form and those specified in all its superclasses.

Each instance of this class will contain two slots, one to hold the name of the customer the account belongs to and another to hold the current balance. With this definition, you can create new bank-account objects using **MAKE-INSTANCE**.

Using the definition of bank-account just given, new objects will be created with their slots unbound. Any attempt to get the value of an unbound slot signals an error, so you must set a slot before you can read it.