The target population of this survey was defined as the principals of all local secondary schools excluding the international schools. No sampling was required.

This study was conducted by self-administered paper questionnaire, returned by the principals via mail or fax. The data collection period started from 17 May and ended on 10 June, 2016. A total of 79 questionnaires were received via fax and were considered valid. The response rate of this survey was 17.5%, with a standard error of sampling of no more than 5.1%, had it been a representative survey (Table 1).

Table 1. Contact information of the survey

Successful Cases	Distributed Questionnaires	Response rate*	Standard Error**
79	*451*	*17.5*%	*5.1*%

* Response rate is calculated as the number of successful cases divided by the number of distributed questionnaires.
** Calculated as if these are random sample surveys.

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