Tangible or intangible obstructions that block, hinder, delay, deter, or interfere with action, movement, progress, or development (Note: Do not use with physical or learning disabilities; see the Descriptors "Speech Impairments," "Hearing Impairments," etc. For disability-related barriers, see the Descriptor "Accessibility (for Disabled)." Do not use for legal impediments; see the Descriptors "Laws," "Legal Problems," etc.)