Of the 28 MIPEX countries, Belgium and in CA offer migrants the best eligibility to become nationals (see box). Moreover, Belgium is the only MIPEX country to have attained best practice for first generation migrants(see box). Under slightly favourable conditions, migrants can naturalise as long as they have not committed serious crimes or ‘seriously reprehensive behaviour.' They are then partially secure in their status. Decisions to withdraw their nationality often take into account their personal circumstances and offer many legal guarantees and avenues for redress. Yet, if a naturalised Belgian fails to carry out his duties as a citizen, he can have his citizenship withdrawn regardless of how many years he has been a Belgian national. Belgium achieves best practice on dual nationality as CA, FR, IE, PT and the UK.