This chapter examines the life and thought of reformist intellectual and political strategist Saʿid Hajjariyan and the relationship of his engaged theorising to new forms of political organising and mobilisation which steadily burgeoned during the Khatami period. The chapter begins by analysing his highly influential interpretation of Ayatollah Khomeini’s intellectual and political contribution and his contention that it may have given impetus to the disenchantment and secularisation of Iran’s state and legal system. It then elaborates upon the rubric of 'political development', which became central to reformist discourse and was associated with regularised and structured forms of political participation. Such participation would take place through electoral channels but also by means of the establishment of a mass political party, which could leverage popular demands to acquire concessions from entrenched and appointed institutions of the Iranian state. The chapter rounds off by considering the political experiment of the Islamic Mosharekat (Participation) Front of Iran and some of the reasons for its failure to bring about the sweeping change and more liberal and democratic order many of its supporters had anticipated.