wah, you always ask us a difficult question.
Let us discuss about changing the measurement scale.
Actually, while somebody change the measurement scale (from ordinal to interval) using MSI, they do not change that. Naturally, it was the fact that some ordinal variable are come from interval. We categorized it by ourselves so it became an ordinal. Sebut saja lah 'tingkat kesetujuan', sebenarnya kan sangat kontinu sifatnya. CUma sulit menyebut angkanya kalau kita anggap kontinu, makanya kita buat jadi ordinal. Karena asalnya kontinu, MSI bilang ya boleh dong kalau kita buat jadi 'kontinu lagi'.
However, of course, we could not change the measurement scale of 'education level' as continous variable. It does not make sense.