Long-term engagements are beneficial for consultants or agencies as well as the clients who work with them. But it takes the right mix of factors to build productive, lasting client-consultant relationships.
For consultants and agencies, long-term client relationships mean steady income. But more importantly, they mean you can spend more time doing what you love—delivering great results for awesome clients—and less time on business development and proposal writing.
For clients, these long-term relationships mean clarity (the consultant has time to really get to know your business, objectives, and work style), reliability, and continuity. Over time, communications become more efficient, as the consultant becomes less of an external resource and more of simply an extension of your team.