1. An AOP may consist of non-individuals but a BOI has to consist of individuals only. If two or more persons join together, it is called an AOP. But if only individuals join together then it is called a BOI. For example, where X,ABC Ltd. and PQ&Co. (A Firm) join together for a particular venture then they may be reffered to as an AOP. If X,Y and Z join together for a particular venture, but do not constitute a firm then they may be referred to as a body of individuals.
2. An AOP implies a voluntary getting together for a common design or combined will to engage in an income producing activities , whereas a BOI may or may not have such common design or will.