In May 2018, Pakatan Harapan celebrated a shock victory at the Malaysian General Election, and Tun Dr Mahathir Mohamad was sworn in as the country's Prime Minister for the second time. Dr Mahathir's government has committed to political and economic reforms by introducing more transparency, checks and balances and fighting corruption. As promised, it replaced the Goods and Services Tax and brought back the Sales and Services Tax. Dr Mahathir has also sought to defer the High Speed Rail project that the previous Malaysian administration had signed with Singapore, and reiterated his position that the price of raw water sold by Johor to Singapore should be revised. What do the political and economic developments mean for Singapore's relationship with its closest neighbour? What new challenges or opportunities will businesses here now face in their dealings across the Causeway? How can Singapore more effectively manage its relations with Malaysia?