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Thesis (doctoral)--Universität zu Marburg.

Thesis (doctoral)--Universität Jena.

Test data sets have been automatically generated for both numerical and string data types to test the functionality of simple procedures and a good sized UNIX filing system from their Z specifications. Different structured properties of software systems are covered, such as arithmetic expressions, existential and universal quantifiers, set comprehension, union, intersection and difference, etc. A CASE tool ZTEST has been implemented to automatically generate test data sets. Test cases can be derived from the functionality of the Z specifications automatically. The test data sets generated from the test cases check the behaviour of the software systems for both valid and invalid inputs. Test cases are generated for the four boundary values and an intermediate value of the input search domain. For integer input variables, high quality test data sets can be generated on the search domain boundary and on each side of the boundary for both valid and invalid tests. Adaptive methods such as Genetic Algorithms and Simulated Annealing are used to generate test data sets from the test cases. GA is chosen as the default test data generator of ZTEST. Direct assignment is used if it is possible to make ZTEST system more efficient. Z is a formal language that can be used to precisely describe the functionality of computer systems. Therefore, the test data generation method can be used widely for test data generation of software systems. It will be very useful to the systems developed from Z specifications.

This thesis describes a tool that facilitates rapid modeling of devices from informal documents. The ModelMaker tool facilitates the construction of models by analyzing the source specification document and presenting it based on the modeler's need. ModelMaker analyzes and indexes the source document for the noun phrases and identifiers it contains. When the modeler specifies the name of a pin or device that the modeler is working on, ModelMaker will recover any behavioral or structural information about the particular pin or device. ModelMaker can return this information based on the order of how relevant the information is to the model that the modeler is trying to build. The modeling language that can be used for this tool is VHDL. The initial VHDL model is derived from a block diagram of the source document using a schematic capture tool. This VHDL model can be edited inside ModelMaker to add behavioral code and to insert source document fragments as comments. / Master of Science

A fairly general model of the elevator system is presented. Coloured Petri Nets (CPN) and CPN tools are adopted as modeling tools. The model, which is independent of the number of floors and elevators, covers different stages of the elevator system in substantial detail. The model assists simulation-based analysis of different algorithms and rules which govern real elevator systems. The results prove the compatibility and applicability of this model in various situations and demonstrate the expressive power and convenience of CPN. / Thesis / Master of Applied Science (MASc)