Paradigm technique is very powerful technique to describe words and their morphological forms in less effort. This can be used to analyse or to make inflectional forms in any application of NLP, such as MT etc.
Inflectional paradigms are useful when you know only one form of the word and what to construct the others. It is straightforward for MT (to construct surface forms) in POS tagging and lemmatization (to predict inflection of out-of-dictionary words) and so on