  We present the oxygen abundance determination for 90 HII regions in the inner
parts of the grand design galaxy M101. The abundances were derived employing
the P method (Pilyugin 2001a). A comparison is made with previous
determinations using another calibration and direct measurements of electron
temperature to derive the oxygen abundance. The results show agreement with the
abundances derived from the electron temperature method and also show that the
older calibration is not as accurate as the P method.
