A database has been prepared on the measurements and capabilities of the human population in relation to the use and design of workspaces. The two basic requirements are clearance and reach.
Working height is an important element to consider when designing a comfortable workspace. Working height cannot be too high and too low.
A person may not require grab rails in bathroom at the age of 35 but the designer should be aware that they may require that at a later stage and should provide a provision i.e. a support structure within the wall cavity when the bathroom is built.