Human development is a lifelong process that begins at conception and continues through all life stages, involving growth, decline, and changes across biological, cognitive, and socioemotional dimensions. There are orderly patterns of development from head to toe and proximal to distal regions of the body. While development follows similar patterns, rates and outcomes vary between individuals and are influenced by environmental factors. The traditional view of development sees major changes in childhood with little change in adulthood, while the lifespan approach recognizes development continues throughout life. Development involves achieving goals of growth, maintenance, and regulation that vary across stages from a focus on growth in youth to maintenance in middle/late adulthood.