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+1 (800) 933-4463
+1 (412) 257-0600

United States

Main Office
World Corporate Headquarters and Center for Learning & Technology
1225 Washington Pike, Bridgeville, Pennsylvania, 15017-2838, United States
Tel: (800) 933-4463 or 412-257-0600    Fax: (412) 220-2942
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Development Dimensions International (DDI) was founded in 1970. Today, we operate 42 offices and affiliates in 26 countries. As your business continues to expand globally, you need an experienced partner who can work with you regardless of borders, language, and culture. DDI has the presence and the international expertise to get the job done anywhere in the world.

Our world headquarters' office is in Pittsburgh, Pennsylvania, USA and we operate 37 offices in the United States. For more information, call 412-257-0600, toll free in the US at 1-800-933-4463 or email us at

Our Strengths & Accomplishments

Four areas set DDI apart and make us an unequalled partner: Our global presence, the results we help our clients realize, our roster of loyal, top-tier clients, and our experience. Here's a glimpse at some of our experience and impact:

  • DDI has trained and developed nearly 11 million executives and leaders worldwide. Each day, more than 1,000 leaders benefit from one or more of our leadership training or assessment systems.
  • Organizations have hired and promoted nearly 21 million people using DDI's selection systems. More than 8,000 people are hired each day using DDI technologies.
  • More than 20,000 facilitators/instructors have been trained in delivering DDI training.
  • More than 16 million people have been trained using DDI programs and materials. Their newly acquired skills have influenced the work lives of more than 210 million people.

Our Expertise