Common Layers in An Information System Logical Architecture

The following four layers are the most common layers in a logical multilayered architecture for an information system with an object-oriented design:

  • Presentation Layer (a.k.a. UI Layer, View Layer, Presentation Tier.)
  • Application Layer (a.k.a. Service Layer or GRASP Controller Layer )
  • Business Layer (a.k.a Business logic layer (BLL))
  • Infrastructure Layer (Data access layer, Persistence layer, Logging, Networking, and other Services which are required to support a particular Business Layer.)

Some common purposes of the above four layers are for example described in the book about domain-driven design at page 68-74, which is a book that otherwise is focused on describing the Domain layer

Sometimes there is no explicit distinction between the Business Layer and the Application Layer, e.g. the Application Layer is considered as being a part of the Business Layer. On the other hand, it is also possible to even further divide the Application/Business Layers into more layers. For example, if the Model View Presenter pattern is used, then you can consider the Presenter Layer as being a layer between the User Interface Layer and the Application Layer.

The Business Layer can also use a Business Infrastructure Layer (aka low-level business 'services' layer) logically positioned between Business Layer(s) and Infrastructure Layer(s). That layer (BI) is very general and can be used in several application tiers, e.g. a CurrencyConverter.

The Infrastructure Layer may be partitioned into different levels (high-level or low-level technical services). Though, it is not unusual that developers only consider the persistence (data access) and therefore only talk about the Persistence Layer or the Data Access Layer (instead of an Infrastructure Layer or Technical services Layer). In other words, the other kind of technical services are not always being explicitly thought of as being part of any particular layer.

Regarding that all types are not always considered as belonging to one particular layer, according to the "POSA book" (Pattern-Oriented Software Architecture A System of Patterns, page 39) a relaxed layered system (as opposed to a strict layered system) can use so called "shared data definition modules" which are types not belonging in a particular layer.

Famous quotes containing the words common, layers, information, system, logical and/or architecture:

    In common with other rural regions much of the Iowa farm lore concerns the coming of company. When the rooster crows in the doorway, or the cat licks his fur, company is on the way.
    —For the State of Iowa, U.S. public relief program (1935-1943)

    The force of a death should be enormous but how can you know what kind of man you’ve killed or who was the braver and stronger if you have to peer through layers of glass that deliver the image but obscure the meaning of the act? War has a conscience or it’s ordinary murder.
    Don Delillo (b. 1926)

    Theories of child development and guidelines for parents are not cast in stone. They are constantly changing and adapting to new information and new pressures. There is no “right” way, just as there are no magic incantations that will always painlessly resolve a child’s problems.
    Lawrence Kutner (20th century)

    The United States is unusual among the industrial democracies in the rigidity of the system of ideological control—”indoctrination” we might say—exercised through the mass media.
    Noam Chomsky (b. 1928)

    Opera, next to Gothic architecture, is one of the strangest inventions of Western man. It could not have been foreseen by any logical process.
    Kenneth MacKenzie Clark, Baron of Saltwood (1903–1983)

    All architecture is great architecture after sunset; perhaps architecture is really a nocturnal art, like the art of fireworks.
    Gilbert Keith Chesterton (1874–1936)