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With its increased sensitivity and resolution, the  Planck  satellite is expected to improve the measurement of most cosmological parameters by several factors with respect to current  Wilkinson Microwave Anisotropy Probe  results. The actual performance, however, may depend upon various aspects of the data analysis. In this paper, we analyse the impact of specifics of the data analysis on the actual final results. We also explore the synergies in combining  Planck  results with future galaxy surveys. We find that  Planck  will improve constraints on most cosmological parameters by a factor of 3–4 and on the tensor‐to‐scalar ratio  r  by a factor of 9. Also, inflationary parameters, like   r ,  n  s   and  n  run , are practically not degenerate any longer. The tensor spectral index, however, is little constrained. A combination of the 70 to 143 GHz channels will contain about 90 per cent of all possible information, with 143 GHz polarization information carrying about half of the constraining power on  r . Also, the error on  r  degrades by a factor of 2 if no B modes are considered in the analysis. High‐ l  temperature information is essential for determination of  n  s  and Ω b , while improving noise properties increases the  l ‐range where  Planck  would be cosmic‐variance‐limited in polarization, implying a significant improvement on the determination of   r , τ  and  A  s . However, a sub‐per‐cent difference in the full width at half‐maximum used in the data analysis with respect to the one in the map will result in a bias for several parameters. Finally,  Planck  will greatly help future missions like  Large Synoptic Survey Telescope  and  Cosmic Inflation Probe  reach their potentials by providing tight constraints on parameters like  n  s  and  n  run . Considering  Planck  together with these probes will help in breaking degeneracies between Ω K  and Ω Λ  or Ω dm  and   f  ν  , resulting in improvements of several factors in the error associated with these parameters.

Cosmological parameters after WMAP 5: forecasts for Planck and future galaxy surveys