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Message: [QUOTE="Jason, post: 530628"] I've been known to use both, but not interchangeably. An abstract class is very useful for things that you don't want to instantiate, for example a factory class that has a single method who's job it is to spit up an instance of several related classes based on some criterion. I would be careful of the blanket statement that an interface is "better" ... It is certainly better for some things and in some implementations, most quite probably, but there are cases and situations where an abstract class is not only viable, it's also an exceptional resolution. Just my 2 krupplenicks on the subject. [/QUOTE]