requirement before it can be made. Commencement An SSI will not typically have legal force immediately. Rather, it may require parliamentary approval, and may specify a "commencement day" on which it comes into force. For example, the order bringing into force the Bankruptcy (Scotland) Act 2016 was made on 15 September 2016, laid before Parliament on 21 September 2016, and has a commencement day of 30 November 2016. Types Rules, regulations, and orders While SSIs are separate from UK SIs, they generally appear to follow the same naming convention for rules, regulations, and orders. The Scottish Parliament and Scottish Government have not, however, as of October 2016, published official guidance defining the terms, and so it cannot be known with certainty whether the definitions used for SSIs and SIs are identical. These definitions were established by the so-called "Donoughmore Committee" of 1932, and recommended in official guidance published by the Her Majesty's Stationery Office. The committee recommended that: Rules should set out procedure – how specific public bodies conduct themselves. Regulations should set out substantive law – how members of the public, companies, and so on conduct themselves. Orders should exercise executive power, or the power to take judicial decisions. These definitions mostly hold true for SSIs, with some key differences. The Parliamentary Counsel Office recommends that, from 2016, rules only be used set out procedure for courts, tribunals and other bodies, and that regulations be used for everything else – including commencement orders. That is not to say that orders are not used, as certain older Acts specify powers to create subordinate legislation as powers to create orders. A common example is the Road Traffic Regulation Act 1984 which, among other powers, provides that an authority "may by order restrict or temporarily prohibit use of [a] road." In 2015, approximately 160 orders were made under this Act, representing around 36% of all SSIs in 2015. Orders in Council An Order in Council is legislation made by the sovereign to exercise executive power, although in reality Orders are made by the Privy Council and approved by the sovereign. An Order in Council is primary legislation when made under the Royal Prerogative, and subordinate legislation if made under an Act of the Scottish Parliament. When an Order in Council is used to exercise a power granted by an Act, such Orders are made as SSIs. Orders in Council are often used