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Domain constraints can be established that apply to the models being created during the modelling process itself , and they can be utilised to guide the process and constrain the legitimate models which can be built . But Dr. Chowdhary does not enter values into models ; she builds the models that other actuaries use . Technical aspects of modelling were examined and the modelling issues that they raised were discussed . The main contributions of this approach are : ( 1 ) it is a general and extensible framework for the problem of visualisation in planning systems , which enables the modelling of the domain from an information visualisation perspective ; ( 2 ) it allows a tailored approach for visualisation of information in an AI collaborative planning environment ; ( 3 ) its models can be used separately in other problems and domains ; ( 4 ) it is based on real standards that enable easy communication and interoperability with other systems and services ; and ( 5 ) it has a broad potential for its application on the Semantic Web . This matrix could be observed from a travel survey or estimated by some model . They also use such tools to assess how well the computer models are doing ; then they use this knowledge to judge how reliable the models are for forecast purposes . First , he notes that Article 5.2 of Annex A of the Framework Agreement , a copy of which was provided by the Commission in the course of the inquiry , reads : General conditions of contracts shall be drawn up in conformity with the models in international use , such as the general regulations and conditions for supply contracts financed from Phare funds . In fact , teacher modeling of strategic reading has been an important component in all models of comprehension strategy instruction ( e.g ., Beck et al ., 1997 ; Duffy , Roehler , & Herrmann , 1988 ; Palincsar & Brown , 1984 ; Pearson , 1996 ; Pressley & Harris , 1990 ) . Sansweet notes that all of the models and props were acquired from private collections before he joined Lucasfilm . The models could be individual solid or surface parts , or entire assemblies . This perspective may prove much more useful if the modelling is extended to look at the precursors of air campaign planning , such as the formation of a JTF , or selection of a course of action . Not all models are appropriate for all objectives , and models often are run differently depending on study objectives . " All models of these have a black hole at its center that 's eating nearby material to get its energy , and then it spews material out into intergalactic space in the form of a jet . We were motivated by our own awareness that every model has both descriptive power and predictive blind spots .