Requirements engineering research has for a long time focused on specification quality, leading to recommendations of how to engineer “perfect” requirements specifications. Practitioners, however, do not have the time, resources, and interests for overdoing requirements engineering. Rather, many situations call for shortcuts that allow investing effort in those concerns that are critical for success, while reducing effort in other areas where risk is comparably smaller. The social context, smart collaboration processes, and novel ways of looking at the interface between stakeholders and the supplier can be a basis to increase the yield of requirements engineering, while reducing required effort. The International Requirements Engineering Efficiency Workshop (REEW 2011) aimed at initiating, facilitating, and nurturing the discussion on efficient approaches to engineer just good-enough requirements. Requirements engineering was seen as a means that can be simplified, automated, or combined with other practices to achieve successful systems in an economically efficient manner. REEW 2011 provided a platform for the community of practitioners and research experts that are interested in productivity enhancing approaches to requirements engineering. This report describes the workshop results including tactics, practice, and trade-offs for achieving requirements engineering efficiency.