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A testimonial party (Dutch: beginselpartij/getuigenispartij) is a political party that focuses on its principles, instead of adapting them to local or temporal issues in the pursuit of coalition government participation. It is a specific phenomenon in the Netherlands, because of the Dutch system of proportional representation, in which any party that has over 0.66% of the vote can enter the House of Representatives. A typical House of Representatives has 10 or more factions represented. With such a large number of parties, it is all but impossible for one party to win the 76 seats needed for a majority in its own right.
As a result, most Dutch political parties will negotiate and compromise to form a coalition government. Testimonial parties will not compromise; this, combined with the fact that they are usually small parties, makes their participation in a coalition government extremely unlikely. Examples of parties that have referred to themselves as "testimonial" include the orthodox Protestant Reformed Political Party (SGP) and the animal rights-advocating Party for the Animals. In contrast, the term 'program party' is used for parties oriented toward participation in coalitions.
In other countries
The Christian Heritage Party of New Zealand, many members of which had Dutch ancestry, may have been a version of a 'testimonial party' effectively exported to a foreign context; New Zealand's mixed-member proportional representation electoral system discourages the participation of such small religion-based political parties.