Major government projects to attract investment will use a variety of cooperation methods, such as BT, BOT, DOB and so on. What do each of the three ways mean? What are the other ways of cooperation?

I understand several ways of cooperation between the government and enterprises or social investors are mainly bt, bot, tot, as follows:

BT (building-transfer) mode: i.e., building-transfer, in simple terms, the government spends no money, or very little money, and mainly by the The contractor spends money to build, and finally the government receives the facility and pays the contractor a portion of the profit generated after the facility is built as compensation. A typical example is the Shanghai Hongqiao Transportation Hub, where the contracting company pays for the construction, the government gives the surrounding land to the contractor, and the value added to the land after the construction is completed is used as payment.

BOT is: Build-Operate-Transfer, simply put, the government does not appear to be money, the facilities built after the fees collected as compensation to the contractor, charges how long after the complete handover to the government. This model is much more, most of the toll roads and bridges are built this way.

TOT (Transfer-Operate-Transfer) mode to participate in the construction of roads, bridges, tunnels, public **** parking stations and other infrastructure construction and municipal utilities such as urban water supply, gas supply, urban sewage treatment, urban domestic waste treatment, urban rail transit.

BT investment is a kind of "turnkey project" that is, the social investor investment, construction, construction is completed after the "turnkey", the government then repurchase, repurchase, taking into account the reasonable returns of investors. BOT way, the project company in the construction is completed, more than a concession period, both the right to operate and ownership. TOT in operation, on the contrary. First by government departments or state-owned enterprises to build the project, and then a certain period of property rights and operating rights transferred to the investor for a fee, by its operation and management, the investor in the agreed time through the operation of the recovery of all investment and get a reasonable return and then handed back to the government departments or the original unit.