System Modeling - System Modelling

10 important questions on System Modeling - System Modelling

What is the purpose of the model?

Depends if the model is descriptive, prescriptive or predictive

What is a descriptive model?

A descriptive models attempt to answer the "what is" question

What is a prescriptive model?

A prescriptive model answers the "what should be" question by determining the best solution form a given set of conditions. For example, models for planning and site selection are prescriptive in that they quantify environmental, economic and social factors to determine "best" of optimal locations
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What is a predictive model?

Predictive models focus upon the "what is likely to be" questions and predict outcomes based upon a set of input conditions. For example, forecasting models that predict sea level rise

What is the methodology of stochastic models?

They use proabilistic functions to represent random or semi-random behaviour or phenomena

What is the methodology of deterministic models?

They are based upon a well-defined cause-effect relationship. For example, pollution models

What is the methodology of rule-based models?

They address processes by using local (spatial) rules. For example, Cellular Automata are often used for systems that are generally not well understood, but for which local processes are well known

What are deductive approaches?

Deductive approaches use knowledge of the overall situation in order to predict outcome conditions.

What are inductive approaches?

They try to generalize in order to derive more general models

What are the 3 phases of the modelling process?

Model development, model operationalization, model application

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