- From: Wendy A Chisholm <wendy@w3.org>
- Date: Mon, 11 Aug 2003 17:58:36 -0400
- To: Patrick Curran <Patrick.Curran@Sun.COM>
- Cc: www-qa@w3.org, po@trace.wisc.edu, jasonw@ariel.ucs.unimelb.EDU.AU
Patrick, Your response is very helpful. I'll take this back to the WCAG WG to discuss. I expect we'll have more questions in the near future. Thank you, --wendy At 01:00 AM 8/11/2003, Patrick Curran wrote: >Wendy A Chisholm wrote: >>Hello, >> >>The WCAG WG would like to begin implementation testing of WCAG 2.0 this >>fall. I've read QA Framework: Test Guidelines and have a few questions >>about Guidelines 3 and 4. What should a Test Framework look like? For >>WCAG is a test management system an evaluation tool? The SVG Conformance >>Test Suite -- Test Builder's Manual [2] is helpful, but since WCAG is a >>set of guidelines to apply to Web content rather than a language >>specification it is not clear to me what our test suite will look like. >> >>I've drafted some initial thoughts in "DRAFT WCAG 2.0 Implementation >>Testing Framework" [3] >> >>Thoughts? >> >>Thanks, >>--wendy >> >>[1] >><http://www.w3.org/QA/WG/2003/02/OpsET-charter-20030217>http://www.w3.org/QA/WG/2003/02/OpsET-charter-20030217 >> >>[2] http://www.w3.org/Graphics/SVG/Test/svgTest-manual.htm >>[3] >><http://www.w3.org/WAI/GL/implementation-testing/Overview.html>http://www.w3.org/WAI/GL/implementation-testing/Overview.html >> > >Thanks for your questions, Wendy. Since I'm currently working on the next >draft of our TestGL document I'll try to respond. I apologize for the >length of this reply, and for the fact that I'm probably raising as many >questions as I'm answering. > >If I'm interpreting your message correctly, you are asking for >clarification of the terms "test management system" and "test framework", >particularly in the context of WCAG, since it seems somewhat difficult to >apply traditional testing techniques and processes to guidelines such as >yours.Your implementation-testing overview document also seems to raise an >additional question: what is implementation testing, and how should it be >carried out? > >I'll tackle these issues in reverse order: from the general to the specific: > > >1) Implementation testing > >Implementation testing generally refers to the process of testing >implementations of technology specifications. This process serves the dual >purpose of verifying that the specification is implementable in practice, >and that implementations conform to the specification. This process helps >to improve the quality and interoperability of >implementations. > >Your Overview document seems to place considerable emphasis on the >feedback the WCAG WG will receive during implementation testing, and on >the opportunities that this feedback will provide for you to improve your >specification (the Guidelines). This is an important process, and one that >we should probably explore in one of our GL documents (OpsGL?), but it >does seem to me that this is distinct from (though obvoiusly related to) >implementation testing. > >Rather than (or in addition to) focusing on testing implementations of >your specification you seem to be concerned with testing the specification >itself (by watching and learning from the implementation process). The >testing strategy you outline (the discussion of variables, for example) >seems to confirm this interpretation. Moreover, in the 'Questions and >other thoughts' and 'Implementation Framework' sections of your document >you seem to go beyond even the process of gathering >feedback, and start to discuss the encouragement and promotion of >implementation testing itself. > >All of this is admirable, but it might be easier to formulate a strategy >if you made explicit the multiple processes and goals that seem to be >inherent in your document. I see at least three: > >a) The encouragement and support of implementation testing. >b) The process of testing your Guidelines by encouraging their adoption >and by soliciting and incorporating feedback. >c) The creation and organization of conformance test materials. > >The first of these items is addressed, though without much detail, in >Guideline 6 of TestGL: 'Plan for conformance testing'. The second - how >the test materials are themselves tested - does not seem to be addressed >in any of our documents. I'll work on adding something to TestGL. As >you've noted, the third is directly addressed in TestGL, albeit once again >without much detail. > > >2) Testing techniques for Guidelines > >In your message you say "since WCAG is a set of guidelines to apply to Web >content rather than a language specification it is not clear to me what >our test suite will look like". > >While it's true that tests developed to verify conformance with guidelines >such as yours (and ours, in our QAWG documents) will differ from those >developed to verify conformance to a language specification, there are >nevertheless many similarities. > >The principal difference lies in the extent to which the test can be >'automated' (that is, scripted or programmed for machine-execution). While >it's true that some of your tests (for example, some tests for Guideline >1.1 'Provide a text equivalent for every non-text element') can probably >be programmed, most of them (for >example, tests for Guidline 2.1: 'Ensure that all information conveyed >with color is also available without color') will of necessity be >'manual', requiring a human to follow written instructions, and to use >subjective judgement as to whether the results are as expected. > >In either case it's important to clearly define what is to be tested >(which of your guidelines or checkpoints), the context within which it is >to be tested (for example whether the content was static or was >programatically generated), the steps that must be taken to execute the >test, and the expected results. > >Once a test is defined in this manner, it becomes simply an implementation >detail whether the setup, the 'execution instructions', and the comparison >of actual to expected results are encoded in a computer language for >machine execution or in written English for human execution. > >The UAAG and Voice Browser WGs have experience in developing (and >managing, to jump ahead to the next topic) 'interactive' and 'subjective' >tests. If you haven't already done so, you might want to consult with them. > > >3 Test Management System and Test Framework > >As you've noticed, our definitions of these concepts need work. Thanks for >encouraging us to clarify them. > >A Test Management System is a well-defined system for organizing and >classifying tests and associated metadata, such as who submitted the test, >the assertion that it tests, whether it's associated with optional >functionality or with a particular conformance level, etc. All this really >means is that WGs should keep track of the tests that they develop or >collect, and should be able to identify them, classify them, and select >from them as necessary. > >As with the tests themselves, it's more important that this system be >specified and documented than that it be automated. > >By Test Framework we mean a well-defined process for executing tests. A >test framework should ensure that two different testers testing the same >implementation should execute the same tests in the same manner and should >obtain identical results. > >If the installation, configuration, and execution of the test suite is >automated then these goals are more easily achieved, but if this is >impractical then careful specification and documentation will be sufficient. > > >Thanks again for your questions, and for helping us to clarify our own >documents. I hope this response is at least somewhat helpful to you. >Please feel free to follow up - this is an interesting discussion and >there's a lot to be done. > >Patrick Curran: Sun Microsystems representative to W3C QAWG > -- wendy a chisholm world wide web consortium web accessibility initiative http://www.w3.org/WAI/ /--
Received on Monday, 11 August 2003 17:58:52 UTC