This article is based on our discussion session on Milky Way models at the592 WE-Heraeus Seminar, Reconstructing the Milky Way's History: SpectroscopicSurveys, Asteroseismology and Chemodynamical models. The discussion focused onthe following question: "Are there distinct thick and thin disks?". The answerto this question depends on the definition one adopts for thin and thick disks.The participants of this discussion converged to the idea that there are atleast two different types of disks in the Milky Way. However, there are stillimportant open questions on how to best define these two types of disks(chemically, kinematically, geometrically or by age?). The question of what isthe origin of the distinct disks remains open. The future Galactic surveyswhich are highlighted in this conference should help us answering thesequestions. The almost one-hour debate involving researchers in the fieldrepresenting different modelling approaches (Galactic models such as TRILEGAL,Besancon and Galaxia, chemical evolution models, extended distributionfunctions method, chemodynamics in the cosmological context, andself-consistent cosmological simulations) illustrated how important is to haveall these parallel approaches. All approaches have their advantages andshortcomings (also discussed), and different approaches are useful to addressspecific points that might help us answering the more general question above.
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