In T 288/92 the appellant (applicant) contended that the amendment resulted in a limitation of the original claim. The board rejected this argument on the grounds that the expression "subject-matter which extends beyond the content of the application as filed" in Art. 123(2) EPC 1973 prohibited the introduction of any technical information which a skilled person would not have objectively derived from the application as filed, so that the examination of the allowability of an amendment according to Art. 123(2) EPC 1973 was directed to the process of "derivation" (see also T 383/88), as distinct from a simple comparison of the scopes of amended and unamended subject-matters.