Paper and Electronic Portfolios: Saleskits for Technical Communicators in the Twenty-First Century 
In the twenty-first century, technical communicators are discovering that portfolios (electronic and/or paper) are indispensable career tools. Portfolios have many uses because they contain a variety of documents that have been developed with the tools and skills claimed on the resume. In addition, portfolios can be instrumental in getting a promotion or winning a contract.
Smith, Herb J. STC Proceedings (2002). Careers>Portfolios>Consulting