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123 bytes added ,  18:49, 29 May 2016
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A research programme is considered “progressive” if it can make predictions later confirmed by experiment, much in line with the Popperian notion of “novel predictions”. On the other hand, if a theory fails to offer such predictions and merely attempts to “save” itself from a disproving instance, it is considered “degenerative”. Lakatos established the following criteria for appraising modifications:
 {| class="wikitable" style="width: 85%; margin: auto; text-align:center;"
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! style="background-color: #ccffcc;"|Progressive Modifications !! style="background-color: #ffcccc;"|Degenerative Modifications
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| Increase the empirical content of a research programme by making predictions and increasing its precision