- From: Wayne Dick <wayneedick@gmail.com>
- Date: Thu, 4 Oct 2012 01:55:26 -0700
- To: public-wai-rd-comments@w3.org
Dear Metrics Group, More on efficacy Consider the example of SC 2.4.3 2.4.3 Focus Order: If a Web page can be navigated sequentially and the navigation sequences affect meaning or operation, focusable components receive focus in an order that preserves meaning and operability. (Level A) Consider the following experiment: 1. State the treatment goal of this criterion. 2. Determine some measures of efficacy. Say the average number of actions required to accomplish a task with keyboard decided by the average number of actions needed to do the same task with a mouse. A ratio. 3. Determine sample sizes for keyboard users, mouse users and web pages that meet 2.4.3, so that we can get statistically significant results. 4. Run the experiment and determine if 2.4.3 does produce something close to equally effective access. 5. Of course we would have to determine equally effective. For example if the task was essential for employment, could a person get the same amount of work done with this keyboard access? I hope this helps to clarify my concept of efficacy vs. validity. Sincerely, Wayne Dick
Received on Thursday, 4 October 2012 08:55:54 UTC