Perception is the process by which individuals select, organize and interpret stimuli to form a meaningful understanding of the world. Marketers must understand perception and related concepts like sensory systems in order to determine what factors influence consumer purchasing decisions. Consumers rely on their senses of sight, sound, smell, touch and taste to perceive products and make judgments. Interpretation of sensory inputs is based on schemas and can be influenced by stimulus factors, individual characteristics and situational context. Perceptual positioning involves mapping how brands are perceived along attributes to guide future marketing strategies.