Definitions

Stratovolcano   Geologists call Mount St. Helens a composite volcano (or stratovolcano), a term for steep-sided, often symmetrical cones constructed of alternating layers of lava flows, ash, and other volcanic debris. Composite volcanoes tend to erupt explosively and pose considerable danger to nearby life and property. 
In contrast, the gently sloping shield volcanoes, such as those in Hawaii, typically erupt nonexplosively, producing fluid lavas that can flow great distances from the active vents. Although Hawaiian-type eruptions may destroy property, they rarely cause death or injury. 

(http://vulcan.wr.usgs.gov/Glossary/StratoVolcano/description_composite_volcano.html)

Decade Volcano  The Decade Volcanoes project began as part of the International Decade for Natural Disaster Reduction (IDNDR). The aim of the Decade Volcanoes project is to direct attention to a small number of selected, active volcanoes world-wide and to encourage
the establishment of a range of research and public-awareness activities aimed at enhancing an understanding of the volcanoes and the hazards posed by them. The International Association of Volcanology and Chemistry of the Earth's Interior has accepted 15 volcanoes as decade volcanoes.

(http://volcano.und.edu/vwdocs/volc_images/decade/)

Good link for this:  http://vulcan.wr.usgs.gov/Volcanoes/DecadeVolcanoes/framework.html

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