Necessary conditions to proclaim independence

Needed to proclaim independence? 

The most common mistake is to hold a referendum before declaring the secession of a region.

Independence is only controlling access Achieved borders, train stations, airports, and state Delegations in the territory to secede.

The referendum? without the prior check the referendum is useless, just to please other states, states That in the case of Spain if Catalonia no pact With the Spanish state, or conversely, economic stability of creditor country clubs is compromised and the viability of the European Union, reason These Countries are more interested in  a first referendum That a unilateral declaration of independence