The original ideology of the group was radical liberalism, including federalism, co-management and the nationalization of large enterprises.

[4] On 24 September 1976, together with the People's Democratic Party, the Social-Liberal Coalition was established.

[5] In January 1977, the party signed a political alliance with Democratic Convergence of Catalonia (CDC),[6][7][8] which ahead of the 1977 Spanish general election would transform into the Democratic Pact for Catalonia (PDC) coalition for the Congress of Deputies, together with CDC, the Socialist Party of Catalonia–Regrouping (PSC–R) and the National Front of Catalonia (FNC).

The party would secure two seats out of the eleven won by the alliance, which were occupied by Ramón Trías Fargas and Maciá Alavedra, both for the Barcelona constituency.

For the concurrent Spanish Senate election, EDC joined the Democracy and Catalonia coalition, comprising all four PDC parties together with the Catalan Centre (CC) and the Democratic Union of Catalonia (UDC),[9][10] which won two senators, although none was for EDC.