Note: OCR errors may be found in this Reference List extracted from the full text article. ACM has opted to expose the complete List rather than only correct and linked references.

	1	Edward V. Berard, Essays on object-oriented software engineering (vol. 1), Prentice-Hall, Inc., Upper Saddle River, NJ, 1993
	2	Simon Gibbs , Eduardo Casais , Oscar Nierstrasz , X. Pintado , Dennis Tsichritzis, Class management for software communities, Communications of the ACM, v.33 n.9, p.90-103, Sept. 1990  [doi>10.1145/83880.84525]
	3	Richard Helm , Ian M. Holland , Dipayan Gangopadhyay, Contracts: specifying behavioral compositions in object-oriented systems, ACM SIGPLAN Notices, v.25 n.10, p.169-180, Oct. 1990
	4	Johnson, R.E. and Foote, B. Designing reusable classes.J. Object-oriented Program. 1,2 (June/July 1998).22-35.
	5	Karl J. Lieberherr, Component Enhancement: An Adaptive Reusability Mechanism for Groups of Collaborating Classes, Proceedings of the IFIP 12th World Computer Congress on Algorithms, Software, Architecture - Information Processing '92, Volume 1, p.179-185, September 07-11, 1992
	6	Karl J. Lieberherr , Ian M. Holland, Assuring Good Style for Object-Oriented Programs, IEEE Software, v.6 n.5, p.38-48, September 1989  [doi>10.1109/52.35588 ]
	7	K. J. Lieberherr , C. Xiao, Object-Oriented Software Evolution, IEEE Transactions on Software Engineering, v.19 n.4, p.313-343, April 1993  [doi>10.1109/32.223802 ]
	8	K. Lieberherr , C. Xiao, Formal Foundations for Object-Oriented Data Modeling, IEEE Transactions on Knowledge and Data Engineering, v.5 n.3, p.462-478, June 1993  [doi>10.1109/69.224198 ]
	9	Karl J. Lieberherr , Paul Bergstein , Ignaciao Silva-Lepe, From objects to classes: algorithms for optimal objection-oriented design, Software Engineering Journal, v.6 n.4, p.205-228, July 1991
	10	Lieberherr, R.J. Hursch, w., silva- Lepe, L, and Xiao, C. Experience with a graph-based propagation pattern programming tool. In International-Workdhop on CASE. IEEE Computer Society, Washington, D.c., PP. 114-119.
	11	Lieberberr, K.J., The Art of Growing Adaptive Object-Oriented Software.PWS Publishing Co., Boston, Mass., 1995.
	12	Polya, G.How to Solve It. Princeton university Press, Princeton, N.J., 1949.
	13	Anthony Ralston , Edwin D. Reilly, Encyclopedia of computer science (3rd ed.), Van Nostrand Reinhold Co., New York, NY, 1993
	14	James Rumbaugh, Controlling propagation of operations using attributes on relations, ACM SIGPLAN Notices, v.23 n.11, p.285-296, Nov. 1988
	15	Dionysios C. Tsichritzis , Frederick H. Lochovsky, Data Models, Prentice Hall Professional Technical Reference, 1982
	16	Wilde, N. and Huitt, R. Maintenance support for object-oriented programs. In Conference on Software Maintencance. IEEE.Press, New York, 1991,PP.162- 170.
	17	Akinori Yonezawa, ABCL: an object-oriented concurrent system, MIT Press, Cambridge, MA, 1990

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