A more deliberate and carefully planned process - what are they on.
Currently most IT procurements in government require a bid process that takes between a year and 18 months, and costs the IT suppliers a lot of money. Think lost opportunity, so a bid team will consist of a minimum of 5 and up. So even if we assume a low salary, your costs are going to be north of £100,000 per person per year.
Behind this there will be a at least 10 departmental employees, and a similar number of consultants. Remember that the department has to go through the process of selecting a supplier from a long list down to a short list of 3 through to contract award.
Usually business change represents at least as much again as the value of the IT contract in costs on the business, but these are usually swept under the carpet.
There are short cut catalogue processes available for smaller or urgent contracts. Actually the 3 month bid cycle for even contracts of £20 - 30 Million works pretty well.
Oh, and the contract price always includes cost recovery for the two contracts the winner didn't win as well as the ones they do.
So one can see that if departments actually start dealing with business change properly, the project costs and bid timescales will extend. Failure rate will go down, not that they are actually that high anyway. In commerce, the CEO can usually say, I like Sharepoint lets implement it across the company through those nice chaps I met at the golf club, a minister, permanent secretary or Agency CEO can't do that.