A writing sample demonstrates your writing abilities and your analytical skills. In an extremely competitive market, it is an excellent resource for law firms to narrow down their candidates. Your writing sample should be 5 to 12 pages in length and should be an example of your finest work. Often, a document from course work is the best choice simply because you will have reviewed it multiple times and have received feedback from your professor. Incorporate any suggestions you receive in that regard and make certain it is a polished product.