Quantifier elimination in p-adic fields

We present a tutorial survey of quantifier-elimination and decision procedures in p-adic fields. The p-adic fields are studied in the (so-called) $P_n$--formalism of Angus Macintyre, for which motivation is provided through a rich body of analogies with real-closed fields. Quantifier-elimination and decision procedures are described proceeding via a Cylindrical Algebraic Decomposition of affine p-adic space. Effective complexity analyses are also provided