While most investment companies separate fixed income and equity departments, MFS Investment Management, Boston, has been emphasizing teamwork between the two.

Five years after implementing this change, the $107 billion fund group claims to be reaping the rewards. For the past five years through Oct. 31, MFS' international equity funds ranked in the top-performance decile, according to Lipper, New York. The MFS International New Discovery Fund, a small-cap value fund, ranked first of 143 funds.

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