Although Preston mostly investigated measures of "correctness" or "pleasantness," other works may also investigate other subjective qualities, such as whether a language is "formal" or "casual", "polite" or "rude", "educated" or "uneducated."
Meskipun Preston biasanya meneliti "ketepatan" atau "kehalusan," karya-karya lain meneliti kualitas subyektif lain, seperti apakah suatu bahasa "formal" atau "santai", "sopan" atau "kasar", "terpelajar" atau "tak terpelajar."