Four papers from the University of California at San Diego (UCSD) Project on Human-Computer Interfaces are presented in this report. "Evaluation and Analysis of User's Activity Organization," by Liam Bannon, Allen Cypher, Steven Greenspan, and Melissa Monty, analyzes the activities performed by users of computer systems, develops a framework for discussing the characteristics of these activities, and provides a number of conceptual guidelines for developing an interface that will support activity coordination. "A Proposal for User Centered System Documentation," by Claire O'Malley, Paul Smolensky, Liam Bannon, Eileen Conway, Janice Graham, Jeffrey Sokolov, and Melissa Monty, outlines a set of proposals for the development of system documentation based on an analysis of user needs. Three specific proposals are outlined--a quick-reference facility, a command-line database, and a facility for full explanation and instruction--and a way of combining these facilities into an integrated, structured manual is suggested. "Questionnaire as a Software Evaluation Tool," by Robert Root and Stephen Draper, reports on a study investigating the strengths and weaknesses of questionnaires as software evaluation tools. "Design Principles for Human-Computer Interface," by Donald Norman, discusses some of the properties that useful design principles should have and presents examples of a tradeoff analysis. References are listed for three of the papers. (Author/LMM)