Acq Notes

Process Inputs, Outputs and Loops are part of teh steps that are included in the Systems Engineering Process. Process Inputs  The customer’s/User’s needs, objectives and requirements in terms of capabilities, measures of effectiveness, environments, and constraints initiate the systems engineering process. A few of the inputs include: Customer Needs/Objectives/Requirements Measures of Effectiveness (MoE), Environments, Constraints […]

The physical architecture is the physical layout of a system and its components in a schema.  It refers to some representation of the structure or organization of the physical elements of the system.  The physical architecture should be part of the Allocated and Product Baselines. Definition: A physical architecture is an arrangement of physical elements

An Operational Requirements Document (ORD) was replaced by the Capability Development Document (CDD).  The ORD described the overall requirements for one system, how it interacts with other systems, and a system’s performance goals. An ORD is generally more detailed than a Concept of Operations (CONOPS). Older programs will have an ORD. The Mission Needs Statement

A requirement is an attribute of a product, service, or system necessary to produce an outcome(s) that satisfies the needs of a person, group, or organization. Operational Requirements are capabilities, performance measurement (Measures of Effectiveness, Measures of Performance, Measures of Suitability & Technical Performance Measurements), and processes needed to address mission area deficiencies, evolving threats,

An Open-Standard System Architecture (OSSA) is an architecture development approach that utilizes open standards to reduce the cost/risk of ownership of weapons systems, delay system obsolescence, and allow the fielding of capability more quickly. An open systems approach reduces weapon system cost by facilitating the use of widely accepted standard products from multiple suppliers in

Modular Open Systems Approach (MOSA) is an integrated business and technical strategy for the assessment and implementation of open systems in the DoD. An open system is a system that employs modular design tenets, uses widely supported and consensus-based standards for its key Interfaces, and is subject to Validation and Verification, including Test and Evaluation,

Modeling and Simulation (M&S) is the use of models, including emulators, prototypes, simulators, and stimulators, either statically or over time, to develop data as a basis for making managerial or technical decisions. The terms “modeling” and “simulation” are often used interchangeably. [2] M&S is a tool used in systems engineering to gather information to make

Measures of Effectiveness (MOE) are measures designed to correspond to the accomplishment of mission objectives and the achievement of desired results. They quantify the results to be obtained by a system and may be expressed as probabilities that the system will perform as required. The Capability Based Assessment (CBA) defines the MOE’s and articulates them

Interfaces are the functional and/or the physical interface between two components with a system. The components can be internal or external to the system.  It’s key to understand these interfaces in systems engineering to make sure systems components work properly with each other. See Interface Management Interface definition and control Interface definition and control are

Interface Management identifies, develops, and maintains the external and internal interfaces necessary for system operation. It supports control measures (Configuration Management) to ensure that all internal and external interface requirement changes are properly documented in accordance with the configuration management plan and communicated to all affected configuration items. Definition: Interface management includes the activities of defining,