A BSTRACT This article assesses Scotland's constituency party organizations. In particular, it examines the level of membership and societal penetration evident in Scotland's party organizations, and aims to place this in comparative perspective. It also examines Scottish local parties in relation to party organizational models that have the grassroots as their focus, and suggests that Scottish local party organizations demonstrate a broad convergence around the "modern cadre" party model of Koole (1994). The first section outlines a number of important themes within the party organization literature and provides an overview of the data utilized, primarily an extensive survey of Scottish constituency parties carried out in the aftermath of the 2003 Scottish parliament election. Part two examines the development of party membership and societal penetration in Scottish constituencies and places Scotland comparatively. The third part examines intra-party politics, while the fourth moves on to discuss candidate selection. The fifth section outlines the resources and organizational coverage of local parties. The concluding discussion assesses the quantitative and qualitative aspects of party organizational models and their applicability in relation to grassroots party organization in Scotland.This article assesses Scotland's constituency party organizations and seeks to categorize them in relation to comparative party organizational models which have the grassroots party as their central focus. This is important for a number of reasons. As a "basic element" of party organization (Duverger, 1964), local parties are central to many of the functions fulfilled by political parties. Assessing the types of local organization parties have is therefore crucial to an understanding of the democratic health of any country.More specifically, however, two paradoxes can be identified in Scottish party and electoral politics. Firstly, with the Scottish National Party (SNP) contesting elections in Scotland, it might be expected that a greater number of mainstream parties might be associated with higher participation. Nevertheless, electoral evidence suggests that political participation in Scotland might be in a more advanced state of decline than many other regions or countries. For instance, in the 2005 general election, at 60.6%,