Abstract: The invention relates to mechanisms for adjusting the height of horizontal surfaces, particularly adjustable work surfaces. One application of the invention is an adjustable computer work station for physically impaired individuals. The adjustable work surface comprises a work surface, a lever arm having a first end that is in association with the work surface and a second end that is pivotly fixed such that when the lever arm pivots from a substantially horizontal position to a substantially vertical position the vertical position of the work surface changes, an adjusting means for pivoting the lever arm, and a stabilizing means for retaining the work surface in a substantially horizontal position.