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The National Federation of the Blind Thursday gave Blackboard, the e-learning giant, its top accessibility certification. Blackboard is the first learning-management company to earn the certification, although federation spokesman Chris Danielsen says the group had not tested all of Blackboard's competitors. Given that learning-management systems are so critical to modern education, it started working with Blackboard; the company was able to make a number of accessibility improvements in its latest version, released in the spring. Since Blackboard is by far the biggest player in the learning-management market, the federation's stamp of approval represents a big step for the visually impaired in an age when such online tools have become crucial even to brick-and-mortar institutions, Danielsen says.