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Abstract:
Within one generation, software has become one of the principal sources of wealth in the world. The development and use of software has grown faster than for any artifact in the history of the world. Probably no topic or subject in history has accelerated in its rate of practice as software has. Software development now needs to mature into a disciplined activity to overcome the difficulties that have traditionally plagued it. Software developers, engineers, and project managers need a reference that describes the evolution of software: where it has been, and where it is going. The Laws of Software Process: A New Model for the Production and Management of Software reveals a novel and compelling structure for development that redefines the very nature and purpose of software. The author explains how, in the modern "knowledge economy," software systems are not "products" in the classical sense, but is the modern medium for the conveyance of information. Literally, software is the currency of the knowledge basis of wealth in today's society.From this definition flows a new assessment of the basics of software development: the purpose of methods and processes; a comparison of programming languages; and an analysis of quality management, cost estimation, and project management and completion. The groundbreaking perspective outlined in this book serves as an expert guide for successful planning and execution of development projects.
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Abstract:
The Priority Inbox feature of Gmail ranks mail by the probability that the user will perform an action on that mail. Because “importance” is highly personal, we try to predict it by learning a per-user statistical model, updated as frequently as possible. This research note describes the challenges of online learning over millions of models, and the solutions adopted.
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Abstract:
The term psi denotes anomalous processes of information or energy transfer that are currently unexplained in terms of known physical or biological mechanisms. Two variants of psi are precognition (conscious cognitive awareness) and premonition (affective apprehension) of a future event that could not otherwise be anticipated through any known inferential process. Precognition and premonition are themselves special cases of a more general phenomenon: the anomalous retroactive influence of some future event on an individual’s current responses, whether those responses are conscious or nonconscious, cognitive or affective. This article reports 9 experiments, involving more than 1,000 participants, that test for retroactive influence by “timereversing” well-established psychological effects so that the individual’s responses are obtained before the putatively causal stimulus events occur. Data are presented for 4 time-reversed effects: precognitive approach to erotic stimuli and precognitive avoidance of negative stimuli; retroactive priming; retroactive habituation; and retroactive facilitation of recall. All but one of the experiments yielded statistically significant results; and, across all 9 experiments, Stouffer’s z = 6.66, p = 1.34 × 10-11 with a mean effect size (d) of 0.22. The individual-difference variable of stimulus seeking, a component of extraversion, was significantly correlated with psi performance in 5 of the experiments, with participants who scored above the midpoint on a scale of stimulus seeking achieving a mean effect size of 0.43. Skepticism about psi, issues of replication, and theories of psi are also discussed.
