Generally, the introduction of a dissertation takes up 10% of the total word count limit. So, if the overall volume of your PhD dissertation project ranges from 80,000 to 100,000 words, the introduction ranges from 8,000 to 10,000 words. If your Master’s thesis ranges from 15,000 to 20,000 words, make sure the introduction is about1,500 to 2,000 words.