INTERNATIONAL  TELECOMMUNICATION  UNION

		     ITU-T RECOMMENDATION SUMMARY


Rec. No. : X.293

Title :	OSI conformance testing methodology and framework for protocol  
	recommendations for CCITT applications - test realization

Study Group : VII - Data Communications Networks

Version : New

Date of adoption : 1992

Notes : Also published as ISO/IEC 9646-4: 1991


Recommendations X.290 and X.291 define a general methodology for 
testing the conformance of implementations to OSI protocol 
specifications and/or transfer syntaxes issued as CCITT 
Recommendations or International Standards; these Recommendations also 
put requirements on the production of OSI conformance testing 
Recommendations and standardized Abstract Test Suites (ATS). 
Recommendation X.292 defines a standardized test notation, the Tree 
and Tabular Combined Notation (TTCN), for the specification of a 
standardized Abstract Test Suite.

Once OSI conformance testing standards and standardized Abstract Test 
Suites are available, the test results obtained by different test 
laboratories should be comparable, if they base their test operations 
on the same reference standardized ATS. Recommendation X.294 puts 
requirements on the conformance assessment process, so that test 
results can be compared with those of other test laboratories, and can 
have a wide acceptance. Recommendation X.293 in the X.290-Series 
Recommendations concentrates on the intermediate stage, namely, 
Test Realization. Before the test preparation can begin, a Means of 
Testing the Implementation Under Test (IUT) has to be made available.

Test Realizers are those organizations which take responsibility for 
providing such a Means of Testing (MOT). Recommendation X.293 places 
requirements on Test Realization, to ensure that the execution of test 
cases reflects the behaviour specified in the reference standardized 
Abstract Test Suite. In this way, the purpose of the standardized ATS 
is achieved.



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