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The Logical Framework Approach takes the form of a four-by-four project table, often referred to as a "Logframe". The rows represent types of events that take place as a project is implemented: Activities, Outputs, Purpose and Goal (from bottom to top on the left hand side — see EC web site under external links).
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The four views of the model are logical, development, process, and physical view. In addition, selected use cases or scenarios are used to illustrate the architecture serving as the 'plus one' view. Hence, the model contains 4+1 views: [1] Logical view: The logical view is concerned with the functionality that the system provides to end-users.
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PERA Reference model: Decision-making and control hierarchy, 1992. Purdue Enterprise Reference Architecture (PERA), or the Purdue model, is a 1990s reference model for enterprise architecture, developed by Theodore J. Williams and members of the Industry-Purdue University Consortium for Computer Integrated Manufacturing.
This framework, form or model is called "logical" because it follows logical reasoning; where deductive reasoning is use in identifying a hierarchy of problems, using the cause and effect process and then deductive reasoning is used to design the Goal, Objectives (outcomes), Activities (outputs), Verifiable Indicators and the Means of Verification.
The first logical framework was Automath; however, the name of the idea comes from the more widely known Edinburgh Logical Framework, LF. Several more recent proof tools like Isabelle are based on this idea. [1] Unlike a direct embedding, the logical framework approach allows many logics to be embedded in the same type system. [3]