Procurement process design is not only a problem in public bodies, there is a lot of corruption in private companies as well where a procurement person would strike a deal with a sales person. This deal can range from "a nice watch" to "I like a swimming pool", depending on the contract value.
That said, I also think that the current procurement methods are broken and that a less rigorous procurement process would eliminate contractors that specialise in government procurement.
One way would be to implement a randomised audit where the deal would be re-examined and the procurement officer would have to defend every choice he made. if 5% of the deals were audited then bad actors would be caught very rapidly.
An other approach would be to adapt the jury-trial approach to government procurement and have them review every procurement contract.
Third approach would be to combine this to reduce the workload.
That said, I also think that the current procurement methods are broken and that a less rigorous procurement process would eliminate contractors that specialise in government procurement.
One way would be to implement a randomised audit where the deal would be re-examined and the procurement officer would have to defend every choice he made. if 5% of the deals were audited then bad actors would be caught very rapidly.
An other approach would be to adapt the jury-trial approach to government procurement and have them review every procurement contract.
Third approach would be to combine this to reduce the workload.