Design And Realization Of Internet Based Testing System

Paperless examination based on computer technology is a process of establishment and management of item bank, selecting exam questions to compose exam papers, making examination on computer and grading exam papers. It can effectively improve the problems under conventional model, which are low efficiency, difficulty to control exam quality and high expense of exam papers for storage and traffic. Paperless examination is deemed to be the trend of all exam models in future, however, the exam systems at present mostly are with the defects of small scale in item bank and single exam question type, some of which are specific application in one subject direction, and these defects extremely confined the popularity of paperless examination model.Considering some certain special application, the design theory and principle of Internet Based Testing System are expounded. The basic architecture, work flow and partition of every system functional module are described, while the process from initializing item bank to accomplishing test and generating grade is presented.In order to guarantee the system performance thoroughly, the special characters of data organization and data process are analyzed and database structure is suitably designed. Considering the educational examination theory and proper data access technology, many key designs adapting to paperless examination are accomplished, which are user management mechanism based on dynamic menu, data access mechanism of a good flow of large data object process, selecting strategy in call course, establishment and maintenance of item bank, anti-cheating mechanism of changing the order of test questions randomly.According to the role-based access control strategy, dynamic menu of system is designed and logic division between user and access authority is implemented. Considering the development of database technology, database structure is reasonably designed and multi exam question type is well implemented. According to the educational test theory, the distribution of exam question difficulty index and separation index are adjusted dynamically in item bank, it makes all kinds of exam question type probable. At the beginning of exam, the exam question sequence numbers and choice sequences are disordered, so it can effectively prevent cheating behaviors from exam candidates.In practice, IBTS is able to meet the needs of practical application, and has good expansibility.