title: GDD
text: # GDD
  
  GDD may mean:
  
  * Game design document, a design document specific to video games.
  * Gaseous detection device, a technology used with some electron microscopes and similar instruments
  * Geographically Distributed Development
  * Glaucoma drainage device
  * Global Data Dictionary
  * Global Drug Development
  * Global developmental delay, a childhood medical disorder
  * Goal-Directed Design, a user interface design method developed by Alan Cooper
  * Group delay dispersion (Group velocity dispersion), effect of a medium on an optical signal
  * Google Developer Day, Google promotional events for developers
  * Great Dragon's Dale, a Russian-language video gaming magazine
  * Green Degree Directory
  * Growing degree-day, a unit for measuring climatic warmth over a period of time
  