textbook or tutorial first, especially if you only know OOP from
languages like C++ or Java. If on the other hand you are already
familiar with CLOS, you should be aware that @eieio{} does not implement
-the full CLOS specificiation and also differs in some other aspects
+the full CLOS specification and also differs in some other aspects
(@xref{Introduction}, and @ref{CLOS compatibility}).
A @dfn{class} is a definition for organizing data and methods