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  2. Functional decomposition - Wikipedia

    en.wikipedia.org/wiki/Functional_decomposition

    Functional Decomposition is a design method intending to produce a non-implementation, architectural description of a computer program. The software architect first establishes a series of functions and types that accomplishes the main processing problem of the computer program, decomposes each to reveal common functions and types, and finally ...

  3. Structured analysis - Wikipedia

    en.wikipedia.org/wiki/Structured_analysis

    Also known as a functional decomposition approach, it focuses on cohesion within functions and coupling between functions leading to structured data. [11] The functional decomposition of the structured method describes the process without delineating system behavior and dictates system structure in the form of required functions.

  4. Structured analysis and design technique - Wikipedia

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

    SADT can be used as a functional analysis tool of a given process, using successive levels of details. The SADT method not only allows one to define user needs for IT developments, which is often used in the industrial Information Systems, but also to explain and present an activity's manufacturing processes and procedures. [3]

  5. Bottom-up and top-down design - Wikipedia

    en.wikipedia.org/wiki/Bottom-up_and_top-down_design

    A top-down approach (also known as stepwise design and stepwise refinement and in some cases used as a synonym of decomposition) is essentially the breaking down of a system to gain insight into its compositional subsystems in a reverse engineering fashion. In a top-down approach an overview of the system is formulated, specifying, but not ...

  6. Armstrong's axioms - Wikipedia

    en.wikipedia.org/wiki/Armstrong's_axioms

    Given a set of functional dependencies , an Armstrong relation is a relation which satisfies all the functional dependencies in the closure + and only those dependencies. . Unfortunately, the minimum-size Armstrong relation for a given set of dependencies can have a size which is an exponential function of the number of attributes in the dependencies conside

  7. Function model - Wikipedia

    en.wikipedia.org/wiki/Function_model

    The functional perspective is one of the perspectives possible in business process modelling, other perspectives are for example behavioural, organisational or informational. [10] A functional modeling perspective concentrates on describing the dynamic process. The main concept in this modeling perspective is the process, this could be a ...

  8. Boyce–Codd normal form - Wikipedia

    en.wikipedia.org/wiki/Boyce–Codd_normal_form

    Boyce–Codd normal form (BCNF or 3.5NF) is a normal form used in database normalization. It is a slightly stricter version of the third normal form (3NF). By using BCNF, a database will remove all redundancies based on functional dependencies.

  9. Chase (algorithm) - Wikipedia

    en.wikipedia.org/wiki/Chase_(algorithm)

    The chase is a simple fixed-point algorithm testing and enforcing implication of data dependencies in database systems.It plays important roles in database theory as well as in practice.