1. Data The term data refers to qualitative or quantitative attributes of a variable or set of variables.

2. Primary & Secondary data Data observed or collected directly from first-hand experience is called primary data. Published data and the data collected in the past or other parties is called secondary data

3. Method of collecting primary data Interview or personal investigation method Observation or indirect Investigation through appointment of investigator Investigation through questionnaires Mailed questionnaires Telephonic interview E-mail method

4. Method of collecting secondary data International organization. Ex: UNO, IMF, WB, ILO, FAO Government and semi-government organization. Ex: PSC, LGRD, EC, UGC Commercial organization. Ex: DSE, CSE, FBCCI Newspaper periodicals. Ex: Times, News Week, The Economist