One tricky problem is making sure that each satellite knows where its sisters are.

ECONOMIST: Birds of a feather

In the past fortnight another tricky problem to do with enlargement has come closer to resolution: sales of land.

ECONOMIST: The EU��s summit in Gothenburg

Digital shoplifting has become an increasingly tricky problem in Japan, where snaps of magazine fashion have been taken and sent to friends.

BBC: Camera phone users in China

This is a tricky problem.

FORBES: Is A Family Member Ripping Off Your Aging Parent?

The fluctuation in demand during the day, and the fact that workers want uninterrupted shifts, makes the problem tricky.

FORBES: Hurry Up And Wait

The tricky thing about electronics is that when you solve one problem you create another.

FORBES: It's all in the packaging

As with many tricky situations, the first step towards recovery is admitting the problem.

FORBES: Financial Fixes For Every Age

Experts and leading government agencies have been working on the space junk problem for decades, but it's a tricky one to solve, Schonberg told CNN.

CNN: STORY HIGHLIGHTS

But it struggled to agree on a valuation of Prodeco with Xstrata, and would presumably face the same problem with its other assets meaning a merger would be tricky to negotiate.

ECONOMIST: Xstrata and Glencore

Instead, players create their own experience which can make it tricky for StarTek's support staff to find out just what is causing the problem.

BBC: Gamers play for a living

Indeed, establishing a cause for Terence's blackouts has proved a tricky task for everyone, with highly qualified neurologists and cardiologists unable to say for certain just where his problem lies.

BBC: Heart monitor implant makes NI medical history