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
