Actor model History[edit] Major software implementation work was done by Russ Atkinson, Giuseppe Attardi, Henry Baker, Gerry Barber, Peter Bishop, Peter de Jong, Ken Kahn, Henry Lieberman, Carl Manning, Tom Reinhardt, Richard Steiger and Dan Theriault in the Message Passing Semantics Group at Massachusetts Institute of Technology (MIT). Research groups led by Chuck Seitz at California Institute of Technology (Caltech) and Bill Dally at MIT constructed computer architectures that further developed the message passing in the model. See Actor model implementation. Research on the Actor model has been carried out at California Institute of Technology, Kyoto University Tokoro Laboratory, MCC, MIT Artificial Intelligence Laboratory, SRI, Stanford University, University of Illinois at Urbana-Champaign,[6] Pierre and Marie Curie University (University of Paris 6), University of Pisa, University of Tokyo Yonezawa Laboratory and elsewhere. Fundamental concepts[edit] Formal systems[edit] Applications[edit]
Lean Lean software development (LSD) is a translation of lean manufacturing and lean IT principles and practices to the software development domain. Adapted from the Toyota Production System,[1] a pro-lean subculture is emerging from within the Agile community. Origin[edit] The term lean software development originated in a book by the same name, written by Mary Poppendieck and Tom Poppendieck.[2] The book presents the traditional lean principles in a modified form, as well as a set of 22 tools and compares the tools to agile practices. Lean principles[edit] Lean development can be summarized by seven principles, very close in concept to lean manufacturing principles: Eliminate waste[edit] In order to eliminate waste, one should be able to recognize it. A value stream mapping technique is used to identify waste. Amplify learning[edit] Software development is a continuous learning process with the additional challenge of development teams and end product sizes. Decide as late as possible[edit]
Reactive – Typesafe Platform - Typesafe Get Started Now With Typesafe Activator What is a Reactive application? Reactive applications are a new class of applications that are becoming more and more prevalent in both Consumer and Enterprise-facing environments. Reactive applications are fundamentally different to the traditional web-based or mobile applications seen today and are distinguished by having one or more of the following defining traits: Event-Driven: Enables parallel, asynchronous processing of messages or events with ease. Scalable: Can scale within and across nodes elastically to provide compute power on-demand when it’s needed. Resilient: The ability to recover and repair itself automatically in order to provide seamless business continuity. Responsive: Rich, engaging, single page user interfaces that provide instant feedback based on user interactions and other stimuli. Typesafe Reactive Platform Typesafe Activator Typesafe Activator helps you get started with the Typesafe Reactive Platform. A Solid Foundation
Agile software development Agile software development is a set of principles for software development in which requirements and solutions evolve through collaboration between self-organizing,[1] cross-functional teams. It promotes adaptive planning, evolutionary development, early delivery, and continuous improvement, and it encourages rapid and flexible response to change.[2] Agile itself has never defined any specific methods to achieve this, but many have grown up as a result and have been recognized as being 'Agile'. The Manifesto for Agile Software Development,[3] also known as the Agile Manifesto, was first proclaimed in 2001, after "agile methodology" was originally introduced in the late 1980s and early 1990s. History[edit] Incremental software development methods trace back to 1957.[6] In 1974, E. The Agile Manifesto[edit] In February 2001, 17 software developers[12] met at the Snowbird resort in Utah to discuss lightweight development methods. Agile principles[edit] Evolutions[edit] Overview[edit] RAD[edit]
Mark Lynas Main work and publications[edit] In January 2007, Lynas published Gem Carbon Counter,[4] containing instructions to calculate people's personal carbon emissions and recommendations about how to reduce their impact on the atmosphere. In 2007, he published Six Degrees: Our Future on a Hotter Planet, a book detailing the progressive effect of global warming in several planetary ecosystems, from 1 degree to 6 degrees and further of average temperature rise of the planet. Special coverage is given to the positive feedback mechanisms that could dramatically accelerate the climate change, possibly putting the climate on a runaway path. In 2008, National Geographic released a documentary film based on Lynas's book, entitled Six Degrees Could Change the World.[6] This latter position was attacked as patronising and naive by some developing world commentators, including one featured in a Channel Four debate after the programme aired. "In defence of nuclear power"[edit] References[edit]
Scrum (development) Scrum is an iterative and incremental agile software development framework for managing product development. It defines "a flexible, holistic product development strategy where a development team works as a unit to reach a common goal", challenges assumptions of the "traditional, sequential approach" to product development, and enables teams to self-organize by encouraging physical co-location or close online collaboration of all team members, as well as daily face-to-face communication among all team members and disciplines in the project. A key principle of Scrum is its recognition that during a project the customers can change their minds about what they want and need (often called "requirements churn"), and that unpredicted challenges cannot be easily addressed in a traditional predictive or planned manner. Later, Schwaber with others founded the Scrum Alliance and created the Certified Scrum Master programs and its derivatives. Each sprint is started by a planning meeting.
Counterfactual conditional Examples[edit] The difference between indicative and counterfactual conditionals, in a context of past time reference, can be illustrated with a pair of examples in which the if clause is in the past indicative in the first example but in the pluperfect subjunctive in the second: If Oswald did not shoot Kennedy, then someone else did.If Oswald had not shot Kennedy, then someone else would have. A corresponding pair of examples with present time reference uses the present indicative in the if clause of the first sentence but the past subjunctive in the second sentence's if clause: If it is raining, then he is inside.If it were raining, then he would be inside. Here again, in the first sentence the if clause may or may not be true; the then clause may or may not be true but certainly (according to the speaker) is true conditional on the if clause being true. Psychology[edit] People engage in counterfactual thinking frequently. Comprehension[edit] Reasoning[edit] Psychological accounts[edit]
Extreme programming Planning and feedback loops in extreme programming. Extreme programming (XP) is a software development methodology which is intended to improve software quality and responsiveness to changing customer requirements. As a type of agile software development,[1][2][3] it advocates frequent "releases" in short development cycles, which is intended to improve productivity and introduce checkpoints at which new customer requirements can be adopted. Critics have noted several potential drawbacks,[5] including problems with unstable requirements, no documented compromises of user conflicts, and a lack of an overall design specification or document. History[edit] Although extreme programming itself is relatively new, many of its practices have been around for some time; the methodology, after all, takes "best practices" to extreme levels. Origins[edit] The first time I was asked to lead a team, I asked them to do a little bit of the things I thought were sensible, like testing and reviews.
Download Games | Free Download Games at IncrediGames Games Games Scrum – Beginners Guide To Scrum Scrum is an agile way to manage a project, usually software development. Agile software development with Scrum is often perceived as a methodology; but rather than viewing Scrum as methodology, think of it as a framework for managing a process. In the agile Scrum world, instead of providing complete, detailed descriptions of how everything is to be done on a project, much of it is left up to the Scrum software development team. This is why in Scrum development, for example, a sprint planning meeting is described in terms of the desired outcome (a commitment to a set of features to be developed in the next sprint) instead of a set of Entry criteria, Task definitions, Validation criteria, Exit criteria (ETVX) and so on, as would be provided in most methodologies. Scrum relies on a self-organizing, cross-functional team. And in Scrum, a team is cross functional, meaning everyone is needed to take a feature from idea to implementation. The product backlog is another artifact of Scrum.