The value of vocabulary comparisons within one source can be demonstrated by examining the relatively small corpus left by Trakl. So even a comparison of vocabulary contained in the only two publications which occurred during Trakl's lifetime - the collections "Gedichte" und "Sebastian im Traum" can yield useful results. These texts are both roughly the same size but exhibit a tendency to diverge in both theme and style. (There follows an example: cf. 3. below). From this it is obvious that these tools can provide greater results when applied to the works of someone as prolific as Goethe. Tools of comparison as envisaged here may perhaps be able to provide data on the difference in his early works and those of later life. Up till now this has only be achieved on the basis of single words or phrases.
If the corpus is extended sufficiently, a multitude of possibilities to examine and compare authors, and even epochs, will ensue.