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1 byte removed ,  07:08, 20 April 2017
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# the modification is in organic unity with the rest of the programme.
Thus, according to Lakatos, there are three types of regressive (''ad hoc'') modifications. A modification is '''regressive''' if at least one of the following obtains:[[CiteRef::Lakatos (1971a1971)|pp. 112, n. 2]]
# it does not increase the empirical content of the programme, i.e. it doesn't make novel predictions or increase their precision/accuracy (''ad hoc<sub>1</sub>'');
# it introduces excess empirical content, but fails to corroborate any of this excess content empirically (''ad hoc<sub>2</sub>'');