The proposed web-based knowledge assessment is based on flexible educational model and allows to implement adaptive control of learning process as well as to implement knowledge testing environment according to the requirements of student's knowledge level, their personal abilities and his subject learning history. The learner knowledge model can be constructed as a sub graph of the global knowledge domain graph. The paper presents the architecture of student self-evaluation and on-line assessment system TestTool. The system is explored as an assessment engine capable to support and improve the individualized intelligent self-instructional mode of learning, grounded on the GRID distributed service architecture.

Simulation-based e-learning is recently budding demand for the next generation of e-learning. Learning about dynamic phenomena is essential in many domains. That approach allows the student to imitate real processes using models and to obtain knowledge and experience during the process of learning. The proposed graphical modelling method is based on systematic point of view, experiential learning and expert-based modelling requirements. The contextual graph of action specification is used as a basis to set the requirements for service software specification and attributes of learning objects (LO). The paper presents the enhanced architecture of the student self-evaluation and on-line assessment system TestTool (TT). The system is explored as an assessment engine capable of supporting and improving the individualized self-instructional and simulation-based mode of learning, grounded on the GRID distributed service architecture. This architecture, services and method are being examined in study modules for Kaunas University of Technology (KTU) students and some organizations.

In this paper we discuss the TestTool system as an established testing system model, the one that is being used in real educational settings and supports self-assessment as well as testing learning practices. We then elaborate how this learning object-based system is being re-engineered and extended within the context of Web service oriented architecture. Testing Web service implementation along with considerations regarding how e-learning services from distributed Learning Objects could be composed is given in the final part of the paper.

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Simulation-based e-learning is recently budding demand for the next generation of e-learning. Learning about dynamic phenomena is essential in many domains. That approach allows the student to imitate real processes using models and to obtain knowledge and experience during the process of learning. The proposed graphical modelling method is based on systematic point of view, experiential learning and expert-based modelling requirements. The contextual graph of action specification is used as a basis to set the requirements for service software specification and attributes of learning objects (LO). The paper presents the enhanced architecture of the student self-evaluation and on-line assessment system TestTool (TT). The system is explored as an assessment engine capable of supporting and improving the individualized self-instructional and simulation-based mode of learning, grounded on the GRID distributed service architecture. This architecture, services and method are being examined in study modules for Kaunas University of Technology (KTU) students and some organizations.