The Progress Party appeared too late to qualify as one of the original parties in Janda's 1950-1962 ICPP study. It continued to1990 and qualified for the Harmel-Janda study of party change in Denmark, Germany, the U.K. and U.S.

The essay on party politics in Denmark from 1950 to 1962 says:

The Progress Party burst upon the Danish political scene in 1973 as a tax protest party and emerged as the second largest party with 16 percent of the votes. The party retained most of its strength over the next two elections, but it has not been regarded as a responsible partner in coalition governments.

The essay on party politics in Denmark from 1963 to 2000 says:

The FRP was founded as a protest party in 1972 by Mogens Glistrup on a platform of demands for an end to taxation and bureaucracy. The party exploded onto the scene in the 1973 "earthquake" elections, when it drew 16 percent of the vote away from the four old parties to become the second-largest faction in the legislature. The party was largely ostracized and never joined a governing coalition, considered by the established parties to be an unreliable partner. The FRP's strength declined throughout the 1980s, briefly revived in the 1988 elections, and then sank again. The Danish People's Party (DF) split from the FRP in 1995, and the party just barely made the two percent cutoff for legislative representation in 1998.

Consult the index to variables for annual scores of the party's issue orientation, organizational complexity, centralization of power, and coherence from 1950 through 1990.