This document discusses various design basics and elements that interior designers consider when planning spaces. It covers building structure, functional planning, spatial relationships, lighting, color, texture, and other factors. It then discusses basic design principles like line, form, space, balance, and harmony. Specific elements of design are outlined like point, line, planes, and three-dimensional forms. Concepts involving size, scale, proportion, harmony and contrast are also defined. The goal is to weave all these elements together to create a cohesive whole that is pleasing to human perception.