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This work presents a sensitivity analysis of double slope solar still having N similar compound parabolic concentrator integrated evacuated tubular collectors in series connection (NCPCETC-DS) by incorporating heat transfer coefficient, exergy gain and exergy efficiency using one-at-a-time method. The sensitivity investigation for collector has also been done. All expressions of various parameters have been fed to computational code developed in MATLAB - 2015a for May month of New Delhi climatic situation. Heat transfer coefficients, exergy gain and exergy efficiency values have been estimated for different cases in which one input variable is varied keeping other input parameters as constant and the computation is continued till the completion of estimation for all input parameters. The exergy gain for collector, exergy gain for NCPCETC-DS and exergy efficiency for NCPCETC-DS have been estimated to be most sensitive with regard to concentration ratio having mean sensitivity figure values as 1.88, 1.97 and 1.94 in that order. [ABSTRACT FROM AUTHOR]