Purpose: To highlight the lacunae in ICA law and propose draft articles to the reform thereof. Originality: The analysis of three legal systems, Common, Civil, and Sharia Law for common principles as applied to ICA in Investor-State Arbitrations. Key literature / theoretical perspective: Comparative Law Design/methodology/approach: Grounded theory and Comparative law as well as policy analysis. Findings: A harmonised ICA Law (HICALC) is feasible. Research limitations/implications: Common ground exists. Practical and Social implications: Greater trust, increased trade, higher ICA credibility and world peace.