Final answer:
Effective communication is the number one critical success factor in integrations, involving clear conversations, sharing perspectives, and defining communication expectations.
Step-by-step explanation:
The number one critical success factor in integrations is effective communication. When collaborating with multiple parties, particularly in long-distance situations, communication plays a crucial role in ensuring success. This involves using secure platforms to share information, having clear and jargon-free conversations, and sharing perspectives and priorities. Defining modes of communication and expectations also contributes to successful integrations.