Recently Unilever challenged Procter & Gamble to prove their advertising claim that P&G’s Fairy brand of washing-up liquid lasted twice as long as Unilever’s Persil brand. The result that followed provides a great lesson for deciding how to pick your battles.

I’ve just kicked off another project through my firm, Product People Limited. With the inevitable flurry of project start-up activity, a couple of basic tasks have reminded me how important it is for product managers to be flexible, whenever possible.