DDA may refer to:
*DDA (delay differential analysis), a nonlinear time series analysis tool
*
Dda (DNA-dependent ATPase), a DNA helicase
*
Delhi Development Authority
The Delhi Development Authority (DDA) is a statutory body established under the Delhi Development Act, 1957, under the jurisdiction of the Ministry of Housing and Urban Affairs, Government of India to "promote and secure the development of Del ...
, the planning agency for Delhi, India
*
Demand deposit account, a deposit account held at a bank or other financial institution
*
Demand-driven acquisition, a model of library collection development
*
Deputy district attorney, state prosecution in American legal system
*
Digital differential analyzer, a digital implementation of a differential analyzer
*
Digital differential analyzer (graphics algorithm), a method of drawing lines on a computer screen
*
Disability Discrimination Act 1992
The ''Disability Discrimination Act 1992'' (Cth) is an Act passed by the Parliament of Australia in which prohibits discrimination against people with disabilities in employment, education, publicly available premises, provision of goods and ...
, Australian legislation
*
Disability Discrimination Act 1995
The Disability Discrimination Act 1995 (c. 50) (informally, and hereafter, the DDA) is an Act of the Parliament of the United Kingdom which has now been repealed and replaced by the Equality Act 2010, except in Northern Ireland where the A ...
, UK legislation
*
Disability Discrimination Act (Switzerland)
The Disability Discrimination Act (DDA) is a Swiss federal law that prohibits discrimination against people with disabilities. It also establishes the Bureau for the Equality of Persons with Disabilities, Federal Bureau for the Equality of Perso ...
*
Discontinuous Deformation Analysis, an analysis procedure used in physics and engineering
*
Discrete dipole approximation
Discrete dipole approximation (DDA), also known as coupled dipole approximation, is a method for computing scattering of radiation by particles of arbitrary shape and by periodic structures. Given a target of arbitrary geometry, one seeks to calcul ...
, method for computing scattering of radiation by particles of arbitrary shape
*
Division on Dynamical Astronomy, a branch of the American Astronomical Society
*
Doha Development Agenda
The Doha Development Round or Doha Development Agenda (DDA) is the trade-negotiation round of the World Trade Organization (WTO) which commenced in November 2001 under then director-general Mike Moore. Its objective was to lower trade barriers a ...
of the World Trade Organization
*
Dual Dynamic Acceleration, an Intel technology for increasing single-threaded performance on multi-core processors
*
Dubai Development Authority, a Dubai Government authority that oversees the development, control, municipal, economic and immigration functions across select free zones clusters and other communities by various master developers throughout Dubai
*
Dutch Dakota Association, a Dutch organisation dedicated to preserving and operating classic aircraft
*Dynamic difficulty adjustment or
dynamic game difficulty balancing
Dynamic game difficulty balancing (DGDB), also known as dynamic difficulty adjustment (DDA), adaptive difficulty or dynamic game balancing (DGB), is the process of automatically changing parameters, scenarios, and behaviors in a video game in real- ...
, a method of automatically adjusting video game difficulty based on player ability
{{dab