Naturally, it is important analyzing and perfecting methods that handles pronoun resolution.  However, I observe that, depending on the genre of the text, pronouns can be rare.  Thus, a good algorithm that deals only with pronouns may not be very useful in practice, especially when the corpus is small.  Noun phrases, on the other hand, are more common.  This is because they convey more information and are on the whole more interesting referents.  Most writers, therefore, prefer using descriptive noun phrases to “boring” pronouns.  Consequently, it is more important to first introduce noun phrases to already existing algorithms that handles pronouns (and perfect them based how they perform), than to perfect them straightaway.  This is done by examining the types of sentence structures on which the algorithms fail.