The Interpersonal Dynamics Inventory (IDI) was initially developed in the United States by Dr. Richard E. Zackrison, Ph. D. in 1977. His decades-long work resulted in the instrument as it exists today, which emphasizes the interpersonal tendencies of human nature while remaining sensitive to the varying behavioral norms of cultures around the world. The tool is currently managed and distributed by Effectiveness Consultants, a Santa Barbara, Ca. based consulting firm owned by Zackrison's son, Dr. Eric Zackrison.

Unlike industry tools like the Meyers-Briggs, the Interpersonal Dynamics Inventory draws on both self-perception and input from significant others in the workplace, for instance, co-workers, supervisors, and subordinates. The resulting feedback allows an individual to understand their social style and own managerial strengths and weaknesses.

Throughout the years, the IDI tool has been consistently tested and adjusted to ensure its foundational approach can translate to modern users and practice. The IDI tool is now fully operational in a digital format while continuing to employ the groundbreaking outcomes of decades of behavioral-based research.