Women engineers have been in the public limelight for decades, yet we have surprisingly little historically grounded understanding of the patterns of employment and education of women in this field. Most studies are either policy papers or limited to statistical analyses. Moreover, the scant historical research so far available emphasizes the individual, single and unique character of those women working in engineering, often using anecdotal evidence but ignoring larger issues like the patterns of the labour market and educational institutions. Crossing Boundaries, Building Bridgesoffers answers to the question why women engineers have required special permits to pass through the male guarded gates of engineering and examines how they have managed this. It explores the differences and similarities between women engineers in nine countries from a gender point of view. Through case studies the book considers the mechanisms of exclusion and inclusion of women engineers.