It can also be important to practice modeling. Study the different types, like commercial versus high fashion modeling. Practice runway walk with someone who can observe and critique. Get a friend to take pictures and ask people to honestly assess them. Fortunately, there are many examples of models pursuing their profession on television, and in the pages of most magazines. Studying these examples and practicing them can help people become better models, and some people do become better trained as result of attending acting or modeling schools. People should simply be concerned about schools that promise professional bookings after taking classes, but there are also some good schools that merely train models.

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Multiple models are needed because executives need to evaluate a myriad of changes and options--for example changes to quotas, commission rates, territories, and organizational structures. Attainment levels also need to be modeled--for example, a company may expect sales and the revenues associated with those sales to increase in some areas or with certain product lines, and decrease in other areas or with other product lines. So not only do executives need to model multiple plans, they also need to run multiple attainment scenarios through each of the modeled plans. By modeling both plans and data, executives are empowered to evaluate results and implement the plans that best fit their organization's business model.By modeling commission plans and forecasting related costs, sales and finance executives gain confidence that their sales plans will drive superior performance at a reasonable cost.

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We begin with objective characteristics of models demonstrated to be "valid" and made available to the user community: they should be suitable for archiving in a Physiome Database and for publication. The goal of adhering to a standard for models is to guide the structuring, presentation, and documentation of the model. The model should be made available as a completely documented, verified, and validated model, so that other investigators can reproduce it accurately and easily, or download a working version directly onto their own computer, and then challenge it, examining its behavior against their own data.