Systems Engineering

Phases of Engineering Development

Advanced design/development Engineering Design Integration & Evaluation Software Systems Engineering

Producability

Assuring the product can readily be built at a reasonable cost

Integrated model that includes System Engineering, Software and Hardware Design processes, and program management

Capability Maturity Model Integration (CMMI)

Systems life cycle

Concept Development Engineering Development Post-development

Systems ENGINEERING life cycle

Concept exploration & Development Advanced Development * Dengineering Design Integration & Test/Evaluation

Steps in generating requirements

Definition of initial requirements/needs Develop CONOPS Rationalize and balance requirements

Availability

Design to assure the product is available for use when needed

Maintainability

Design to faciilitate maintenence of the product when it does fail

Reliability

Design to minimize failures

Systems Engineering Management Plan

Documents the overall approach to managing the engineering effort on a program or project

Physical embodiment of functional elements

Electronic Electro-Optical Electromechanical Mechanical Thermal or Thermo mechanical Software

Trade-off analyses

Evaluate options within the design window. Achieve balanced design.

System building blocks can be either:

Functional or Physical

Work Breakdown Structure (WBS)

Hierarchal depiction of all work to be performed on a given project

Important attributes of Risk Management

Identify all potential risk deemed inherent in the target system development environment Estimate the probability of occurrence of each risk Assess the impact or criticality of each identified risk Establish a risk mitigation strategy for each identified risk

Models are

Mathematical representations of the project.

Three phases of Concept Development

Needs Analysis Concept Exploration Concept Definition

Perspectives of architecture

Operational view (User/Operator) Logical view (customer/manager) Physical view (designer/engineer)

Latent Defects

Problems in SW that exist before delivery, not detected during integration and test

Phases of Post Development

Production Operations & Support

Key elements of Systems Engineering Management

Proposal and statemento f work Systems engineering plan and SE management plan Risk management

Principles of balanced design

Reliability Availability Maintainability Producability

Steps of Systems Engineering Method

Requirements Analysis Functional Definition Physical Definition Design Validation

Elements of risk management

Risk assessment - Probability and impact of failure Risk mitigation - Reviews, oversight, testing/analysis, prototyping, requirements relief, alternatives

Functional elements

Signal elements Data elements Material elements Energy elements

Set of software process requirments known as:

Software Capability Maturity Model (SW-CMM)

Physical definition

Synthesizes various possible physical implementations

Systems environment includes

System operator Maintenence Shipping, storage and handling Operating environment Threats

A major issue in design of complex systems is

That many of the component sub systes are legacy systems who's designs cannot be altered or changed

A major attribute of complex systems is

That the component systems in and of them selves are fully functional

Architecture is:

The structure of components, their relationships, and the principless and guidelines governing their design and evolution over time.

Functional definition

Translates requirements into specific functions

Design validation

Validates selected design in operations and use context

Requirements Analysis

Validates/rationalizes/balances requirements