Futures studies is an interdisciplinary field, studying yesterday's and today's changes, and aggregating and analyzing both lay and professional strategies and opinions with respect to tomorrow. It includes analyzing the sources, patterns, and causes of change and stability in an attempt to develop foresight and to map possible futures. Around the world the field is variously referred to as futures studies, strategic foresight, futuristics, futures thinking, futuring, and futurology. Futures studies and strategic foresight are the academic field's most commonly used terms in the English-speaking world.