The motion was carried by a majority of 29 votes, with 62 out of 95 voting BMRA members in favour of the integration.
Initial approval by both councils was made in December 2005, however, the final decision had to be put down to a final BMRA membership vote.
Integrating the services will bring a unified training and development package and a cohesive programme of conference, awards and networking events.
From April 1, BMRA will cease to exist.
Ivor Stocker, chairman of BMRA, said: "We have been in discussions with the MRS over possible integration of services for several years -- with the aim of providing one unified body to coordinate the UK market research sector and better serve the needs of our industry.
"The BMRA and MRS have long shared the remit of providing professional development opportunities to their members, and through this integration, our members will continue to benefit from the BMRA's gold standard services as well as accessing those offered by the MRS.
"The proposal agreed by our members fully retains the culture and enthusiasm of the BMRA while conferring additional benefits which MRS, with its established brand and infrastructure and larger scale of operation, is well-placed to deliver.
"This move provides an opportunity to bring together individuals and companies from across the market research industry to share best practice and help drive the industry forward into a new era."
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