The Development of Digital Learning Content for Individual Instruction－using the “round number and estimation” unit in 5th grade as an example

[[abstract]]The objective of this research is to take “approximate number and computational estimation” unit of Grade Five of elementary school as the teaching content to research and develop the digital individual instruction model, and evaluate the effect of teaching. The so-called “digital individual instruction model” means to establish a set of computerized adaptive diagnostic tests that combines knowledge structure and Bayesian Networks at the approximate number and computational estimation unit of Grade Five of elementary school, and edit and compile the digital individual instruction materials, including teaching media, teaching materials, and on-line remedy teaching animation to provide teachers to use in their teaching. Besides, in order to evaluate the effect of implementation of this teaching model, the research divided the testers into individual instruction group and class teaching group to do the teaching experiment, and to explore the effect of the digital individual instruction model via the test achievements after teaching. The research findings are as follows: 1. The average number of questions of pre-test and post-test administrated by the adaptive diagnostic test is 25.26 questions, 9.74 questions can be decreased approximately, and the average question quantity economizing rate is 27.8%. The prediction accuracy is above 95%. 2. After blending the digital teaching materials into teaching, and doing the remedy, the students’ average scores made progress, whether it is individual instruction group or class teaching group, and reduce the incidence of the bug available, promote the percentage of reaching skill targets. showing that the digital individual instruction materials by this research have the value of application. 3. The individual instruction model has better results then traditional class teaching whether on teaching or remedy, and it can be provided as reference for school education and cram school education. 4. Regarding the effect of implementation of individual instruction model, on teaching and remedy results, the students of low mark group have best performance, and the average achieved grades of progress accomplished more than 10 points