This dissertation tried to establish competence model and also explore its relationship with performance of elementary and secondary school principals,with the use of qualitative and quantitative research methods,such as Critical Incidents Technique,job analysis,Focus-group interview and psychological measurement.

In applying this approach, the experts should first provide initial probabilities of key events concerning the strategic problem and the matrix of the value of interaction between the events, and then cross-impact simulation can be used to calculate the resulting scenario probabilities.

This paper analyzed key event raised in teaching in Australia scholar David Tripp s book and explored its inspiration for China s teaching and researching event.

Customer s feelings about the service quality of an airline are generally based on service encounter and,viewed from the service process,critical incidents in service encounter exercise distinctive influence upon customer s feelings.

Adopted qualitative method, the paper studies the critical incidents of seven kindergarten expert teachers.

Based on deep interview with 9 backbone teachers from 4 kindergartens in Nanjing, this research analyzes the influence of critical incidents on backbone teachers professional growth, and generalizes the characteristics of backbone teachers.

The kindergarteners critical incidents within the first three years since undertaking the work are studied on in this dissertation.

The partition of polygon based on line of sights is analyzed,then the concepts of key events of gap and window about viewshed in polygon are delivered.