More often than not, Leaders are developed "Inside" an organization. At max, they are asked to work on Cross functional projects inside the company. Increasingly, value in the market is being created by ideas that span across industries and customer segments. Would it not be a great idea to develop leaders in an Industry Cohort that will expand a leaders vision and understanding and help them develop solutions that can span an industry and better still across industries. This can also let a company utilize the expertise that organizations have developed (Dell for Supply Chain, P&G for Market Research, McKinsey for Strategy etc)
Leadership Development efforts are internally focused. Rarely is an individual "rented" out to another organization as part of development. At max, Leaders get to interact with people from other organizations/industry in a Management Institute driven program, which is usually restricted to the course of the program.This stops organizations from making the best use of expertise developed by each organization and exposure of leaders remain very restricted.
Organizations as part of their leader development programs can define the key competencies that needs to be developed for the leaders. Then, organizations are selected with whom partnerships can be developed so that there can be leader exchange for a span of time. HR/Business Leadership Initiate the discussion with partner organizations to develop a program to enable leaders to gain as much exposure as possible, as well as keeping this leader exchange purposeful for both organization. Private clouds can be used to bring this cohort of leaders together post their exchange so that they can continue working with each other on projects. Few ideas that i think can help kickstart: a. Start with organizations that are your (close) partner in business, so that trust levels are higher b. Start with partnering with smaller organizations where risk of losing your resource might be lesser c. Have Agreements with leaders that discourage them from joining the other companies for some duration post their rotation d. Utilize contacts with some of your ex-employees who would have moved to these organizations to suggest projects etc where you can partner.