2.1 Study Area, Demography and Socioeconomic Status Current research work was conducted at Mongla upazila (sub-district) of Bagerhat district in Bangladesh. The Mongla upazila occupies an area of 1461.20 sq. km. of which 1260.87 sq. km. is land area. On the other hand the reserve forest area and riverine area is 5.46 and 1.56 sq. km. respectively. It lies between 21° 49´ and 22° 33 ´ north latitude and between 89° 32 ` and 89° 44` east latitude. It is bounded on the north by Rampal upazila, on the east by Morrelganj and Sarankhola upazilas, on the south by the Bay of Bengal and on the west by Dacope upazila of Khulna district [12]. According to CRA report, 2009, the livelihood groups and their corresponding activities of Mongla upazila are very much diversified. The major livelihood activities include farming, fish culture, agro-labor, fishing service, business, van/rickshaw (mechanized van) pulling, cart pulling, date/palm climber), carpenter (wood), masonry, pottery, boat plying, blacksmith, barber, handicraft, imam etc. [8]. In the upazila the distribution of working people shows agriculture 21.41%, fishing 6.23%, agricultural laborer 12.41%, wage laborer 13.39%, commerce 15.09%, and transport 1.94%, service 16.27%, others 13.26% [12]. 2.2 Methods and Data Collection In order to determine the vulnerability of agricultural production and to identify natural disaster simple stratified random sampling method was followed for selecting the villages in Mongla upazila. Mongla upazila consisted of 6 union parishads among them 3 unions were selected. The data collection methods included the Focus Group Discussion (FGD), structured interviews (questionnaire survey) with the community peoples, and oral talk with local experts direct field observation and Key Informant Interviews (KII). A total of 12 FGD sessions were conducted among farmers, day laborer, fisheries and female groups. A total of 144 respondents were selected from 3 villages for questionnaire survey. A total of 5 key informant interviews (KII) were done by sectoral specialists and social/community leader including upazila food and disaster management officer, fisheries’ officer and agriculture extension officer of Mongla Upazila. The further necessary secondary data was pertaining by accessing the relevant information from different books, Reports, maps, website, daily newspapers, journal articles, research thesis, and data from different local government administrative offices like union and upazila office. During data collection the following questions were focused to get the information i) The major hazards of the study area resulting losses in agricultural production ii) The amount of the agricultural production of the area; and iii) The occupational pattern and changes of livelihood during and without disaster. This study was conducted from September 2013 to March 2014. 2.3 Data Processing and Analysis After completion of all the relevant data and information, all of them were tabulated manually including editing, coding. All the data processing and analysis was done using Microsoft Office and Excel program. According to the United Nations Development Programme defines Risk is conventionally expressed by the equation, Risk = Hazard + Vulnerability, [R= (H+V)]; other scientists defines Risk (disaster), vulnerability, and hazard, whose relations it convenient to schematize in a pseudo-equation: R = H x V, [24]. Therefore vulnerability assessment and computation was done following the equation; V= H x R, (Here, V = Vulnerability, R = Risk and H = hazard).