Classroom assessment measures, in the past often limited to multiple-choice and standardized tests, now can involve the creation of portfolios, or collections of pieces of work which the student selects as the best representation of his or her efforts, progress, skills, and accomplishments. Portfolios also usually include teacher evaluations and student self-reflections and can come in several varieties: (1) "developmental" portfolios document improvement in a designated subject area; (2) "teacher planning" portfolios allow teachers to gauge the ability levels of an incoming class; (3) "proficiency" portfolios can be used to determine graduation eligibility; (4) "showcase" portfolios can assemble the best work done across an entire educational career; (5) "employment skills" portfolios can collect assignments that demonstrate work readiness; and (6) "college admission" portfolios can be solicited by admissions officers to judge an applicant's potential for success at a certain academic institution. To solve problems of storage space and of collecting assignments in various media into a cohesive whole, many schools have begun to store portfolios in electronic form on floppy disks or CD-ROM. Software aids like Roger Wagner Publishing's "HyperStudio" and Claris'"FilmMaker Pro" are highlighted, and examples are given of a high school in New York that has implemented an electronic portfolio program. (Contains 13 references.) (BEW)