Even within his own party, trying to maintain credibility on both fronts is difficult.
He argues that France can maintain credibility as a world actor only if it pulls its weight.
Another will be to maintain credibility in (and for) an industry that combines serious science with snake oil.
How do they maintain their credibility as inflation battlers when higher rates may send a weakened U.S., Europe or Japan into a tailspin?
Netanyahu has been under pressure from Israel's central bank to maintain fiscal credibility at a time when the economy is slowing and tax revenues are falling short.
If economists think a country should defend its exchange rate, they will tell the government to raise interest rates (even if it means recession) to maintain its credibility.
If the movement is to maintain its credibility, the charter authorizers must shut down failed schools quickly and limit new charters to the most credible applicants, including operators who have a demonstrated record of success.
But if Mr Sharon and Mr Peres have agreed, at least for the time being, to stop trying to delegitimise Mr Arafat, and to maintain his credibility as a future negotiating partner, what hope is there of such negotiations taking place?
But he also knows that the context is changing in front of his eyes.. The alternative, if Wales is going to keep up with its Caledonian cousins in terms of that four-way administration split, is to accumulate further powers for the Assembly in new fields, in order to maintain the credibility of his seat at the top table.
"We feel it is important to maintain trust and credibility with the audience, " series producer James Honeyborne told the Radio Times.
Also, as Argentina demonstrated in 2002, when a new currency with no credibility is suddenly introduced, monetary conditions have to be kept savagely tight in order to maintain any exchange value for the new currency at all.
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