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  2. Synchronous Data Link Control - Wikipedia

    en.wikipedia.org/wiki/Synchronous_Data_Link_Control

    Synchronous Data Link Control (SDLC) is a computer serial communications protocol first introduced by IBM as part of its Systems Network Architecture (SNA). SDLC is used as layer 2, the data link layer , in the SNA protocol stack .

  3. SDLC - Wikipedia

    en.wikipedia.org/wiki/SDLC

    SDLC may refer to: Systems development life cycle or system design life cycle, which is often used in the process of software development; Software development life cycle or software development process; Synchronous Data Link Control, an IBM communications protocol

  4. Waterfall model - Wikipedia

    en.wikipedia.org/wiki/Waterfall_model

    For example, a problem found in the early stages (such as requirements specification) is cheaper to fix than the same bug found later on in the process (by a factor of 50 to 200). [ 17 ] In common practice, waterfall methodologies result in a project schedule with 20–40% of the time invested for the first two phases, 30–40% of the time to ...

  5. Systems development life cycle - Wikipedia

    en.wikipedia.org/wiki/Systems_development_life_cycle

    A systems development life cycle is composed of distinct work phases that are used by systems engineers and systems developers to deliver information systems.Like anything that is manufactured on an assembly line, an SDLC aims to produce high-quality systems that meet or exceed expectations, based on requirements, by delivering systems within scheduled time frames and cost estimates. [3]

  6. Chromosome (evolutionary algorithm) - Wikipedia

    en.wikipedia.org/wiki/Chromosome_(evolutionary...

    For example, 12.380 becomes the integer 12380 by multiplying by 1000. This must of course be taken into account in genotype-phenotype mapping for evaluation and result presentation. A common form is a chromosome consisting of a list or an array of integer or real values.

  7. Structured analysis and design technique - Wikipedia

    en.wikipedia.org/wiki/Structured_Analysis_and...

    SADT uses two types of diagrams: activity models and data models. It uses arrows to build these diagrams. The SADT's representation is the following: A main box where the name of the process or the action is specified; On the left-hand side of this box, incoming arrows: inputs of the action.

  8. Structured systems analysis and design method - Wikipedia

    en.wikipedia.org/wiki/Structured_systems...

    the distribution of the system, for example, is it centralized to one office or spread out across several? cost/benefit; impact of the new system; Where necessary, the option will be documented with a logical data structure and a level 1 data-flow diagram. The users and analyst together choose a single business option.

  9. 5-HTTLPR - Wikipedia

    en.wikipedia.org/wiki/5-HTTLPR

    The serotonin transporter gene (SLC6A4) with the 5-HTTLPR is located on chromosome 17.The polymorphism occurs in the promoter region of the gene. Researchers commonly report it with two variations in humans: A short ("s") and a long ("l"), but it can be subdivided further. [4]