• Financier provides all capital → investment partnership (مضاربة) can be used.
• Both sides provide capital → partnership (مشاركة) can be used.
• Both invest, but one side alone manages → a combination of partnership (مشاركة) and investment partnership (مضاربة) can be used.
Keeping the legal roles clear prevents the arrangement from being treated like a fixed-return loan. Capital, management, ownership and profit entitlement should each follow the role actually undertaken.