A stage of development may refer to:

Biology:

• Prenatal development, also called fetal development, or embryology.
• Human development (biology)
• Child development stages

Psychology:

• Developmental stage theories, various theories of staged psychological development.

Technology:

• Software release life cycle, software development stages.

Economics:

• Developed country
• Developing country
• Least Developed Countries
• High income country
• Newly-industrialized country

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