But that does not mean they carry on digging: if something isn't working, or if circumstances change, they need to be prepared to force a rethink.
Marks & Spencer suffered a rebuke from its shareholders today over the £15m "golden hello" handed to new chief executive Marc Bolland, but it was not substantial enough to force a rethink of the company's executive pay policy.
I have tried to force a rethink and as a result of many conversations and negotiations, a new clause strengthening the rules and regulations around fracking was accepted by government ministers and has been included in the bill.
The containment vessel protecting the core was said to be undamaged.But in a country where one third of all power is generated by nuclear energy (Japan lacks its own fossil fuels), the crisis is almost bound to force a rethink of the nuclear-energy policy.
That works out at about 0.06% and falls far short of the 30% of users needed to force a rethink.
It lost enough of its transactional customers to force a rethink its approach.
But it did not take long for empirical studies of actual SNS usage trends to force a profound rethinking of this problem-space.
But before all that, he has one last match to play on home soil on Saturday – and with it, the chance to force a major rethink of Australian attitudes towards the Poms before he arrives.
It has to either continue to add valuable businesses to its portfolio or force a rethinking of what Apple is as a company and the multiples it gets based on its earnings.
