Electronic performance support systems (EPSS) help users accomplish tasks, using computational technologies. Scaffolding is the process through which efforts are supported while engaging a learning or performance task. A number of different types of scaffolds are possible, including conceptual, metacognitive, procedural, and strategic. Each of these types of scaffolding is defined in this paper, and a case study involving the application of different scaffolding approaches is presented. The Tactical Readiness Instruction, Authoring, and Delivery (TRIAD) project is developing a set of authoring and delivery tools that will enhance the quality of tactical guidance disseminated through the United States Navy. The bulk of requisite knowledge and skill is developed through experience and personal study of tactical publications (including Tactical Memoranda, or TACMEMOs) and combat system doctrine. TRIAD is a PC-based system being designed and developed to improve the coherence and usability of TACMEMOs. TRIAD will provide authors with an integrated tool set to enable them to create tactical documentation using a variety of multimedia presentation techniques, and to create associated interactive multimedia instruction to support the documented tactic/doctrine. In turn, readers will receive a multimedia tactical documentation "product set" that supports tactic/doctrine presentation and briefing, instruction, quick reference, and facilitation of electronic feedback regarding tactic/doctrine evaluation. TRIAD's online author interview scaffolding of TACMEMOs is emphasized. (Contains 13 references.) (AEF)