The Portfolio and the Utilisation Scenarios and the Use Spectra of a Model

A model portfolio consists of use spectra that define the main use of the model as an instrument in applications. A use spectrum combines a number of utilisation scenarios within model deployment processes. Instruments such as models are used within a utilisation scenario. This utilisation defines the functions a model plays within such deployment processes. Models may serve in several functions. Typically, their utilisation follows stereotypes in dependence on the community of practice.

The portfolio is a combination of tasks one might have in mind while using instruments. The instrument or artefact plays a number of functions. We distinguish, for instance, the following functions:
The utilisation function of a model relates the model purpose to a practice or application cases or application `game' similar to Wittgenstein's language game (we call it better utilisation case and is characterised by answering the classical W-questions (Hermagoras of Temnos defined seven ``circumstances'' as the loci of an issue:
Quis, quid, quando, ubi, cur, quem ad modum, quibus adminiculis (Who, what, when, where, why, in what way, by what means). This frame seems to be rediscovered by J. Zachman)
how, when, for which/what or why, at what/which (business use case), etc.
We add to purpose: application, conventions, custom, exertion, habit, handling, deployment, service, usage, use, and way of using. The model has a role and plays its behaviour within this application game.

We distinguish, for instance, the following functions:

A use spectrum of a model
consists of a combination of functions within an application 'game'. Typical use spectra are:
A model is bound to its spectra.
Deployment outside the spectrum may result in wrong results (deployment ban).

The notion of a model

A model is a well-formed, adequate and dependable instrument that represents other origins within some context based on criteria of adequacy and dependability commonly accepted by its community of practice. A model has - as an instrument - its background with a undisputable grounding of the sub-discipline and with a basis consisting of chosen elements from the sub-discipline. A model is functioning if it is combined with utilisation/deployment methods. A functioning model is effective if it can be successfully deployed according to its deployment scenarios and its portfolio. They thus function in the application scenario ('deployment games').

Some recent papers by B. Thalheim on models and modelling

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