This paper is an empirical survey of Indonesian Islamic bank’s depositors and Islamic bankers. By using an online questionnaire posted in survey website provider, namely www.surveymonkey.com, the survey was conducted from January to March 2009. There are 408 depositors and 17 Islamic bankers (Directors, General Managers, Head of Risk Management Team/Division) who participated in the survey. All (five) Islamic banks (BUS) and twelve Islamic banking unit (UUS) have been represented and all banker respondents correspond to 97% of all Islamic banking institutions. Every individual and Islamic banker had the same chance to be selected since there is no category of respondent (simple random sampling).