Links investigates whether politicians’ investment in constituency service is consequential. It tackles two central questions: Does the type and level of constituency service (CS) provision influence citizens’ political trust and attitudes towards democracy (RQ1)? Does it shape MPs’ political careers (RQ2)? LINKS answers these hitherto overlooked questions, drawing on a mixed-methodology and on an innovative theoretical framework, which postulates the heterogeneous effects of CS. Countering pessimistic views about CS in Africa, it argues that CS is not a distraction from parliamentary duties and thus less democratic than other duties. It also argues that not all types of CS activities carry the same effect, and that MPs’ decisions to prioritise some tasks over others may have distinct effects on citizens’ attitudes and behaviours as well as on MPs’ political careers. By addressing this puzzle, LINKS’ core goals are to: 1) Test the applicability of a new conceptual and theoretical framework for analysing CS; 2) Examine the consequences of different types and intensities of CS, in institutional and contextually diverse countries; 3) Clarify the mechanisms whereby CS shapes citizens’ attitudes and behaviours and MPs’ political careers; 4) Advance the scholarship on political representation; 5) Generate evidence that can inform public debates on democratic developments.