Difference Between Memorandum and Articles of Association. What is MOA and AOA: Objectives, Features & Difference? You know that while forming a company; Memorandum of Association (MOA) and Articles of Association (AOA) are the most essential element. Both play a vital role for company constitution, objectives, power, scope of activities, rules and regulations, rights, duties, responsibilities and etc. Know more about MOA, AOA objectives and special features.