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This comparative study examines survey data from 464 call centers in the United States, 167 in the United Kingdom, and 387 in Canada to explore two questions: whether institutional differences shape employers' choices of ways to improve work force flexibility, both numerical and functional; and whether strategies for numerical flexibility and functional flexibility are related. The results suggest that institutional differences across these liberal market economies--specifically, in dismissal regulations and union strength--did affect how employers chose to achieve work force flexibility. For example, the use of part-time workers was more common in countries with more stringent rules regulating dismissals. Organizational characteristics also mattered, with outsourced firms being more likely than in-house firms to use part-time workers. Evidence also suggests that managers used numerical flexibility and functional flexibility strategies as substitutes: higher employee job discretion was associated with both lower dismissal rates and a lower likelihood of temporary use. [ABSTRACT FROM AUTHOR]