sentences:  The model yields accurate results for thick oxides if, instead of assuming zero initial thickness (or any initial thickness less than 25 nm), we assume that 25 nm of oxide exists before oxidation begins.However, for oxides near to or thinner than this threshold, more sophisticated models must be used.In the 1980s, it became obvious that an update to the Deal-Grove Model would be necessary to model the aforementioned thin oxides (self-limiting cases).