Linear life-cycle model

The typical deliverables of a development cycle (see Pattern 15.13, Interpreting Models for Clients) are not individual completed documents from the linear life cycle. More usually, they might be first draft requirements GUI mockup client feedback second draft requirements critical core code version 1 requirements modified to what we find we can achieve ... 

Matrix models are sets of mostly linear difference equations. Each equation describes the dynamics of 1 class of individuals. Matrix models are based on the fundamental observation that demographic rates, that is, fecundity and mortality, are not constant throughout an organism s life cycle but depend on age, developmental stage, or size. Ecological interactions, natural disturbances, or pesticide applications usually will affect different classes of individuals in a different way, which can have important implications for population dynamics and risk. In the following, I will only consider age-structured models, but the rationale of the other types of matrix models is the same. For an example of this approach applied to pesticide risk assessment, see Stark (Chapter 5). 

Figure 7.4 Life-cycle options. Simplified current linear model for corporate clothing.

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