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  2. Spiral model - Wikipedia

    en.wikipedia.org/wiki/Spiral_model

    The spiral model is a risk-driven software development process model. Based on the unique risk patterns of a given project, the spiral model guides a team to adopt elements of one or more process models, such as incremental , waterfall , or evolutionary prototyping .

  3. Security dilemma - Wikipedia

    en.wikipedia.org/wiki/Security_dilemma

    The spiral model identifies the next step in reasoning about states' behavior after identifying the intensity of the security dilemma. In particular, under given circumstances of the security dilemma, what steps might a threatened state take to derive advantage by attacking first. In other words, the spiral model seeks to explain war.

  4. Spiral of silence - Wikipedia

    en.wikipedia.org/wiki/Spiral_of_silence

    In some cases only a small number of social bots can easily direct public opinion on social media and trigger a spiral of silence model. [34] For example, scholars find out that social bots can affect political discussion around the 2016 U.S. presidential election [35] and the 2017 French presidential election. [36]

  5. Spiral approach - Wikipedia

    en.wikipedia.org/wiki/Spiral_approach

    The spiral approach is a technique often used in education where the initial focus of instruction is the basic facts of a subject, with further details being introduced as learning progresses. Throughout instruction, both the initial basic facts and the relationships to later details are repeatedly emphasized to help enter into long-term memory ...

  6. Software development process - Wikipedia

    en.wikipedia.org/wiki/Software_development_process

    Other methodologies include waterfall, prototyping, iterative and incremental development, spiral development, rapid application development, and extreme programming. A life-cycle "model" is sometimes considered a more general term for a category of methodologies and a software development "process" is a particular instance as adopted by a ...

  7. Logarithmic spiral - Wikipedia

    en.wikipedia.org/wiki/Logarithmic_spiral

    Logarithmic spiral bevel gears are a type of spiral bevel gear whose gear tooth centerline is a logarithmic spiral. A logarithmic spiral has the advantage of providing equal angles between the tooth centerline and the radial lines, which gives the meshing transmission more stability.

  8. Rapid application development - Wikipedia

    en.wikipedia.org/wiki/Rapid_application_development

    Rapid application development was a response to plan-driven waterfall processes, developed in the 1970s and 1980s, such as the Structured Systems Analysis and Design Method (SSADM). One of the problems with these methods is that they were based on a traditional engineering model used to design and build things like bridges and buildings.

  9. Spiral array model - Wikipedia

    en.wikipedia.org/wiki/Spiral_array_model

    In music theory, the spiral array model is an extended type of pitch space. A mathematical model involving concentric helices (an "array of spirals"), it represents human perceptions of pitches, chords, and keys in the same geometric space. It was proposed in 2000 by Elaine Chew in her MIT doctoral thesis Toward a Mathematical Model of Tonality ...