In addition to possessing technical knowledge, interior designers must be creative, imaginative, and persistent and must be able to communicate their ideas in writing, visually, and verbally. Because technology and human experiences change rapidly, designers need to be well read, open to new ideas and influences, and quick to react to changing experiences. Problem-solving and critical thinking skills, and the ability to work independently and under pressure are important traits. People in this field need self-discipline to start projects on their own, to budget their time, and to meet deadlines and production schedules. Good business sense and sales ability also are important, especially for those who freelance or run their own business.