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Abstract
The SFL model has traditionally been presented as a series of levels one within the other in Russian doll style. This is usually represented visually as concentric circles or triangles. The outer layer of this model is that of Ideology, within which are found those of Context (culture and/or situation). Comparison of appropriate texts suggests that the relationship of Ideology to the rest of the model may be somewhat different. Texts may have virtually the same Context of situation in terms of Field, Tenor, and Mode, but differ in both their Ideologies and in their semantic and lexicogrammatical features. Comparison of Newton's Opticks and Huygens' Traité de la lumière provides one such example. Political tracts such as British political manifestos or the professions de foi for French regional elections provide another. This means that it is necessary to reconsider the place of Ideology in the systemic model. Of the possibilities available, that which places Ideology within Tenor seems to be the most appropriate.