System lifecycle

The system lifecycle in systems engineering is a view of a system or proposed system that addresses all phases of its existence to include system conception, design and development, production and/or construction, distribution, operation, maintenance and support, retirement, phase-out and disposal.

Conceptual design

The conceptual design stage is the stage where an identified need is examined, requirements for potential solutions are defined, potential solutions are evaluated and a system specification is developed. The system specification represents the technical requirements that will provide overall guidance for system design. Because this document determines all future development, the stage cannot be completed until a conceptual design review has determined that the system specification properly addresses the motivating need.

Key steps within the conceptual design stage include:

Life cycle

Life cycle may refer to:

Science and academia

Business

Software development

Biological life cycle

In biology, a life cycle is a series of changes in form that an organism undergoes, returning to the starting state. "The concept is closely related to those of the life history, development and ontogeny, but differs from them in stressing renewal." Transitions of form may involve growth, asexual reproduction, and/or sexual reproduction.

In some organisms, different "generations" of the species succeed each other during the life cycle. For plants and many algae, there are two multicellular stages, and the life cycle is referred to as alternation of generations. The term life history is often used, particularly for organisms such as the red algae which have three multicellular stages (or more), rather than two.

Life cycles that include sexual reproduction involve alternating haploid (n) and diploid (2n) stages, i.e., a change of ploidy is involved. To return from a diploid stage to a haploid stage, meiosis must occur. In regard to changes of ploidy, there are 3 types of cycles:

Life Cycle (Whit Dickey album)

Life Cycle is an album by American jazz drummer Whit Dickey recorded in 2000 and released on the Aum Fidelity label. Dickey leads the Nommonsemble, which includes Rob Brown on alto sax and flute, Mat Maneri on viola and Matthew Shipp on piano.

Reception

In his review for AllMusic, Sam Samuelson states "The Nommonsemble pull together a concise and pleasing recording that for the most part proves itself to be relevant and thought-provoking."

The Penguin Guide to Jazz notes that "They're a highly compatible quartet, four thinkers who prefer the dryer end of free jazz and, while the record isn't exactly exciting, it certainly makes its own space."

The JazzTimes review by Aaron Steinberg says "Though obdurate and knotty on the whole, Life Cycle maintains a calm and spacious core throughout, which is due largely to Dickey's drumming and his sensitive interaction with Shipp."

Track listing