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generalizes the explanation structure, making it suit a large scope of examples,
and finally gets a general description from explanation structure and it is the
general description of the generalization of the initial example.
EBL can be used in different application fields including control information
acquirement, knowledge refinement, software reuse, computer aided design and
computer aided instruction. In the traditional programs, the main function of
explanation is to illustrate programs, offer hints and provide better readability.
According to the characteristic of artificial program, explanation has been given
new meaning and it works in:
(1) Making detailed explanation for the results of inference process and
promoting the acceptability of the system;
(2) Tracking wrong decisions and discovering knowledge deficiency and wrong
concepts in the knowledge base;
(3) Training the novice.
The way of explanation thus becomes simpler. The followings are the general
adopted methods of explanation:
(1) Prepared text: make text preparation in English and insert it into programs;
(2) Traced execution: traverse the target tree, retrieve relevant rules by means of
summarizing targets relevant to conclusions in order to show how to reach
the conclusions;
(3) Strategic explanation: denote control knowledge explicitly, i.e. meta-
knowledge is used for general description and rules are totally separated from
domain theory. Explanations that afford solving methods are constructed
from the general depiction of strategy.
EBL mainly adopts traces execution to explain the causation relationship
among knowledge after traversing the target tree. Based on the analysis of cause
and effect the control information is learned.
9.2 Model for EBL
R.M.Keller demonstrated that EBL relates to three different spaces: example
space, concept space and concept description space(Keller,1987). Concept on one
hand can be expressed as a set composed of a certain instances extensively and
on the other hand it can also be denoted as the properties of instances in the
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