Functional Analysis and Allocation: Approaches and Methods

SYSTEMS SCIENCE AND ENGINEERING
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INTRODUCTION
The primary purpose of this kind of the system engineering process operations is to
assist in the transformation of the performance, functional, interface and finally other
requirement which were identified through the analysis of the requirement as placed in the
coherent system of the description as the used functions to properly guide the Synthesis of the
design as the operations follows(Venturelli et al 2017). The designer is therefore expected to
know which kind of the system must operate, how well should they operate and what kind of the
constraint will limit the flexibility of the design. This is effectively accomplished by having all
the functions arranged in the logical sequence thereby decomposing functions of the higher level
into the functions perceived to be of the lower level before the performance can be allocated to
the lower level functions from higher level functions.
The tools that are commonly required include the functional block diagram and
analysis of the timeline. The product is actually a functional architecture which is actually the
description of the system itself. It is expressed in terms of the performance and function
parameters rather than the description of the physical parameters(Xu and Liao 2015). The
facilities of Functional Analysis and Allocation which are used in the traceability obtained from
the requirement as presented for the requirement to the description in the outcome of the
synthesis of the Design. The functions are basically discrete actions which are necessary to be
used in the achievement of the objectives of the system. These particular functions may be
explicitly stated. Alternatively, they may be derived from the requirements which had been
stated previously. Such functions will ultimately be carried out or performed through the
utilization of the personnel, facilities, combination or the facilities(Xu and Liao 2015).

OVERVIEW
Functional Analysis and Allocation (FA and A)
The requirements of the functional, as well as the performance at any level of the
system, will be developed from the higher level within the system which is developed from the
higher level necessities. Functional Analysis and Allocation is usually subjected to process of
repetitions in order to successfully define the functional requirements of the lower level hence
having the architecture defined at every increasing detail at various levels. The requirements of
the systems are therefore allocated as well as defined in details that are considered be detailed
enough so as to assist in the provision as well as verification of the criteria to effectively support
the integrated design system.
The top-down process of the system level translation into the comprehensive design functions as
well as performance criteria.IT actually contains the following:
 Definition of the system in terms of the functionality before the top level function can be
decomposed into the sub-functions. This basically implies that identification at the
necessity of successfully lowering the level of the actions which the system is set to do
 Translation of the higher level performance requirements in a detailed manner.This will
include the constraints or criteria(Howlett et al .2015).
 Identification of the functional grouping to be used in the minimization as well as control
of the interfaces which is basically known as the functional partitioning
 Determination of the functional characteristics of the directed elements or components of
the system before they can be incorporated in the analysis as well as allocation.

 Examination of all life cycle functions which include the eight primary functions as
considered appropriate for the specific project.
 Trade studies performance in order to determine the alternative approaches which are
needed in the requirements.
 Revising the analysis requirements steps as deemed necessary to resolve the issues of the
functionality.
Outputs
The outputs include functional architecture as well as supporting details. The functional
architecture is regarded as the top-down decomposition of the system functions as well as
requirements of the performance.
Inputs
These are regarded as the output requirement analysis
Staging and supporting processes
The supporting processes include decision database, tools as well as models including QFD, the
Functional Flow Block Diagram, Requirement, Allocation Sheet, Data Flow Diagrams,
Diagrams, IDEF charts, Behavior Diagrams among others
Controls
They include the following:
COTS.GFE, Constraints as well as Reusable S/W, choices of the subsystems, System Concept
and finally organizational Procedures.