1. A method for modeling a thermal behavior of an item, comprising: loading a set of generic thermal response equations into an open spreadsheet software application having a graphical user interface of a processor, wherein said set of generic thermal response equations are generated absent data of thermal and spatial attributes of said item; plotting a generic thermal response curve set being based on said generic thermal response equations onto a graph of temperature over time for producing a plotted generic curve set, wherein said graph is visible on said graphical user interface, and wherein said generic thermal response curve set is comprised of a plurality of individual curves defining consecutive artificial layers of said item; generating a limited set of actual thermal response data; loading into said open spreadsheet the limited set of actual thermal response data for said item, wherein said actual thermal response data reflects the actual thermal response of said item subject to conditions meant to induce heat transfer within the item when exposed to a specific environmental temperature for a specific period of time; plotting an actual thermal response curve set being based upon said actual thermal response data onto said graph for producing a plotted actual thermal response curve set, wherein said plotted actual thermal response curve set comprises a plurality of individual curves that define the thermal response of actual consecutive layers of said item; and using said graphical user interface for approximating, a non-linear regression being based on parameters of said generic thermal response equations, which are fixed, by dynamically manipulating a plurality of slidebars where said plotted generic curve set visually fits said plotted generic curve set to said plotted actual thermal response curve set in real-time so that the plotted generic curve set aligns with and matches, as closely as possible, the plotted actual thermal response curve set, which creates and predicts a model thermal response curve set for said item under any thermal environment.