Assisting people with multiple disabilities and minimal motor behavior to improve computer Drag-and-Drop efficiency through a mouse wheel.

Two adults with severe physical and intellectual disabilities tried a new drag-and-drop tool. The tool, DDnDAP, lets users poke the mouse wheel instead of clicking a button.

Researchers used a multiple-baseline design. They measured how fast and how well each person could move pictures on the screen.

Both users got faster and made fewer mistakes. They kept the new skill weeks later.

The mouse-wheel poke gave reliable control even with tiny finger movements.

Shih (2012) built on this work. That study swapped DDnDAP for EDDnDAP, letting users drop items anywhere on screen. The 2012 paper reports large gains after six weeks, so it clearly updates the 2011 design.

Shih et al. (2009) used the same wheel-poke trick, but for pointing, not dragging. The positive results in 2009 set the stage for trying drag-and-drop in 2011.

Shih et al. (2010) tried automatic drag-and-drop software. It moved the cursor for the user, while the 2011 study keeps the user in control with the wheel. Both help, but they give different kinds of independence.

If you support clients who can move only a finger or thumb, a $10 mouse and free DDnDAP driver can open computer access today. No extra gadgets, no new funding cycle. Try wheel-poke first, then move to the newer EDDnDAP if the client needs free-destination drops.