Hand-rolling movements or “combos”

The following additional principles are also espoused often by layout designers today
(Capewell, Coleman, Hallingstad, Piepgrass 06):
• The pinky, being much shorter and weaker than other fingers, should rarely be required to reach anywhere.
• A layout similar to Qwerty is easier to learn for those familiar with Qwerty.
• Hand-rolling movements or “combos” have similar value to hand alternation; so on Qwerty, such sequences AS, DF, JK, and perhaps JL and RE/ER are acceptable. Opinions vary as to which sequences are acceptable and whether they are better or worse than hand alternation, but it seems agreed that combos and alternation are both worthwhile. It should be noted that combos are probably more acceptable on modern keyboards, where keys are easy to press.