A conceptual update of affordance theory that introduces the mechanisms and conditions framework, providing a vocabulary and critical perspective. Technological affordances mediate between the features of a technology and the outcomes of engagement with that technology. The concept of affordances, which migrated from psychology to design with Donald Norman's influential 1988 book, The Design of Everyday Things, offers a useful analytical tool in technology studies—but, Jenny Davis argues in How Artifacts Afford, it is in need of a conceptual update. Davis provides just such an update, introducing the mechanisms and conditions framework, which offers both a vocabulary and necessary critical perspective for affordance analyses. The mechanisms and conditions framework shifts the question from what objects afford to how objects afford, for whom, and under what circumstances. Davis shows that through this framework, analyses can account for the power and politics of technological artifacts. She situates the framework within a critical approach that views technology as materialized action. She explains how request, demand, encourage, discourage, refuse, and allow are mechanisms of affordance, and shows how these mechanisms take shape through variable conditions—perception, dexterity, and cultural and institutional legitimacy. Putting the framework into action, Davis identifies existing methodological approaches that complement it, including critical technocultural discourse analysis (CTDA), app feature analysis, and adversarial design. In today's rapidly changing sociotechnical landscape, the stakes of affordance analyses are high. Davis's mechanisms and conditions framework offers a timely theoretical reboot, providing tools for the crucial tasks of both analysis and design.

Some 13,000 years ago, humans were drawn repeatedly to a small valley in what is now Central Texas, near the banks of Buttermilk Creek. These early hunter-gatherers camped, collected stone, and shaped it into a variety of tools they needed to hunt game, process food, and subsist in the Texas wilderness. Their toolkit included bifaces, blades, and deadly spear points. Where they worked, they left thousands of pieces of debris, which have allowed archaeologists to reconstruct their methods of tool production. Along with the faunal material that was also discarded in their prehistoric campsite, these stone, or lithic, artifacts afford a glimpse of human life at the end of the last ice age during an era referred to as Clovis. The area where these people roamed and camped, called the Gault site, is one of the most important Clovis sites in North America. A decade ago a team from Texas A&M University excavated a single area of the site—formally named Excavation Area 8, but informally dubbed the Lindsey Pit—which features the densest concentration of Clovis artifacts and the clearest stratigraphy at the Gault site. Some 67,000 lithic artifacts were recovered during fieldwork, along with 5,700 pieces of faunal material. In a thorough synthesis of the evidence from this prehistoric “workshop,” Michael R. Waters and his coauthors provide the technical data needed to interpret and compare this site with other sites from the same period, illuminating the story of Clovis people in the Buttermilk Creek Valley.

One of TIME’s Best New Books to Read This Summer “Brilliant—a keen, elegantly written, and scorching account of the American family today. Through vivid stories, sharp analysis and wit, Quart anatomizes the middle class’s fall while also offering solutions and hope.” — Barbara Ehrenreich, author of Nickel and Dimed Families today are squeezed on every side—from high childcare costs and harsh employment policies to workplaces without paid family leave or even dependable and regular working hours. Many realize that attaining the standard of living their parents managed has become impossible. Alissa Quart, executive editor of the Economic Hardship Reporting Project, examines the lives of many middle-class Americans who can now barely afford to raise children. Through gripping firsthand storytelling, Quart shows how our country has failed its families. Her subjects—from professors to lawyers to caregivers to nurses—have been wrung out by a system that doesn’t support them, and enriches only a tiny elite. Interlacing her own experience with close-up reporting on families that are just getting by, Quart reveals parenthood itself to be financially overwhelming, except for the wealthiest. She offers real solutions to these problems, including outlining necessary policy shifts, as well as detailing the DIY tactics some families are already putting into motion, and argues for the cultural reevaluation of parenthood and caregiving. Writtenin the spirit of Barbara Ehrenreich and Jennifer Senior, Squeezed is an eye-opening page-turner. Powerfully argued, deeply reported, and ultimately hopeful, it casts a bright, clarifying light on families struggling to thrive in an economy that holds too few options. It will make readers think differently about their lives and those of their neighbors.

A leading scientist argues that we must consider deploying climate engineering technology to slow the pace of global warming. Climate engineering—which could slow the pace of global warming by injecting reflective particles into the upper atmosphere—has emerged in recent years as an extremely controversial technology. And for good reason: it carries unknown risks and it may undermine commitments to conserving energy. Some critics also view it as an immoral human breach of the natural world. The latter objection, David Keith argues in A Scientist's Case for Climate Engineering, is groundless; we have been using technology to alter our environment for years. But he agrees that there are large issues at stake. A leading scientist long concerned about climate change, Keith offers no naïve proposal for an easy fix to what is perhaps the most challenging question of our time; climate engineering is no silver bullet. But he argues that after decades during which very little progress has been made in reducing carbon emissions we must put this technology on the table and consider it responsibly. That doesn't mean we will deploy it, and it doesn't mean that we can abandon efforts to reduce greenhouse gas emissions. But we must understand fully what research needs to be done and how the technology might be designed and used. This book provides a clear and accessible overview of what the costs and risks might be, and how climate engineering might fit into a larger program for managing climate change.

Cowinner, 2008 Fred Kniffen Book Award. Pioneer America Society/Association for the Preservation of Landscapes and Artifacts How did people living on the early American frontier discover and then become a part of the market economy? How do their purchases and their choices revise our understanding of the market revolution and the emerging consumer ethos? Ann Smart Martin provides answers to these questions by examining the texture of trade on the edge of the upper Shenandoah Valley between 1760 and 1810. Reconstructing the world of one country merchant, John Hook, Martin reveals how the acquisition of consumer goods created and validated a set of ideas about taste, fashion, and lifestyle in a particular place at a particular time. Her analysis of Hook's account ledger illuminates the everyday wants, transactions, and tensions recorded within and brings some of Hook's customers to life: a planter looking for just the right clock, a farmer in search of nails, a young woman and her friends out shopping on their own, and a slave woman choosing a looking glass. This innovative approach melds fascinating narratives with sophisticated analysis of material culture to distill large abstract social and economic systems into intimate triangulations among merchants, customers, and objects. Martin finds that objects not only reflect culture, they are the means to create it.

The world is in the midst of a social media paradigm. Once viewed as trivial and peripheral, social media platforms like Twitter, Facebook and WeChat have become an important part of the information and communication infrastructure of society. They are bound up with business and politics as well as everyday life, work, and personal relationships. This international Handbook addresses the most significant research themes, methodological approaches and debates in the study of social media. It contains substantial chapters written especially for this book by leading scholars from a range of disciplinary perspectives, covering everything from computational social science to sexual self-expression. Part 1: Histories And Pre-Histories Part 2: Approaches And Methods Part 3: Platforms, Technologies And Business Models Part 4: Cultures And Practices Part 5: Social And Economic Domains

A foundational text offering a unified design vocabulary and a common methodology for maximizing the expressive power of digital artifacts. Digital artifacts from iPads to databases pervade our lives, and the design decisions that shape them affect how we think, act, communicate, and understand the world. But the pace of change has been so rapid that technical innovation is outstripping design. Interactors are often mystified and frustrated by their enticing but confusing new devices; meanwhile, product design teams struggle to articulate shared and enduring design goals. With Inventing the Medium, Janet Murray provides a unified vocabulary and a common methodology for the design of digital objects and environments. It will be an essential guide for both students and practitioners in this evolving field. Murray explains that innovative interaction designers should think of all objects made with bits—whether games or Web pages, robots or the latest killer apps—as belonging to a single new medium: the digital medium. Designers can speed the process of useful and lasting innovation by focusing on the collective cultural task of inventing this new medium. Exploring strategies for maximizing the expressive power of digital artifacts, Murray identifies and examines four representational affordances of digital environments that provide the core palette for designers across applications: computational procedures, user participation, navigable space, and encyclopedic capacity. Each chapter includes a set of Design Explorations—creative exercises for students and thought experiments for practitioners—that allow readers to apply the ideas in the chapter to particular design problems. Inventing the Medium also provides more than 200 illustrations of specific design strategies drawn from multiple genres and platforms and a glossary of design concepts.