Extended time is one of the most common testing accommodations provided to students with disabilities. It is also controversial; critics of extended time accommodations argue that extended time is used too readily, without concern for how it changes the skills measured by tests, leading to scores that cannot be compared fairly with those of other…

When the drive to develop and administer tests comes from a public call for accountability in a profession, from the government's response to this call, or from politicians attempting to identify a hot issue, it may be said that the test must first have political validity in order to be implemented. Only after this political validity has been…