Software is easy to copy and difficult to patent, but relationships, culture and customer loyalty are difficult to take away.
These constraints make some evolutionary transitions easy and others more difficult.
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Right here on the flight line in crash landings, the helicopters landing in what are called brown-out conditions, meaning the dust on the desert floor rises up and engulfs the helicopter and it is very difficult for the pilot to see the ground in those conditions and very easy to mess up the landing.
Shifting attitudes toward law and order is not easy, and every new horror story makes the job more difficult.
"Offences of this nature are easy to commit but very difficult and very expensive to detect, " he said.
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Some bosses are far too easy, making the difficult bosses surprising and unexpected.
One of the discoveries he has made through his map research was that people often "loved" maps which were "difficult to use" and hated those maps which were easy to use.
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The biggest supply-side obstacle to future growth may no longer be (if it ever was) excessive regulation or inflexible labour markets, but a corporate culture that finds it easy to tolerate low returns and difficult to tolerate outright failure.
Predicting the future is never easy, and it's particularly difficult in the fast-paced world of videogames.
It comes in three main forms, of which two are easy and opportunistic, and one is difficult and far-reaching.
Graeme Hyslop said some funds were easy to apply for and some were difficult, but it was easier for larger colleges to spend the time and resources working on applications.
"I hope it helps but of course our history is not so easy for many years and many different difficult situations but I think step by step we can make it better, " said Olga, who is Russian.
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Although glaciers are receding, leaving loose rocks and making the terrain more difficult and dangerous, the country's highest peaks remain relatively easy to reach.
It is always easy for politicians to promise lavish future benefits and difficult to cut them back.
So this is -- these are difficult policy challenges, and anybody who says that there's an easy answer to doing something about it right away is just not telling the truth.
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None of this is easy and the longer it is put off the more difficult it will get.
If his analysis is correct and it is difficult to argue with most of it, it is easy to understand why we are in the intelligence predicament in which we are and why bureaucratic reshuffling is not going to do much good.
Arthur is a very easy-going man and this approach is surprising and a little difficult to comprehend.
The Economist has, in the past, argued correctly that the sequencing of the reforms was not optimal, with the relatively easy opening up of currency and financial markets preceding the politically more difficult liberalisation of goods and labour markets.
"It will not be an easy time, and I know that some families will find it particularly difficult, " he warned.
More generally, nations in which it is easy to do business are prosperous, and those in which it is difficult are poor.
By "disable, " Hill said, the agreement means making it difficult to restart a nuclear program by sealing the facility and removing certain components that would not be easy to replace.
She said the set of guidelines had ended up being overly bureaucratic because of a fear of civil litigation, cost-cutting and because it was an easy way to avoid work that was regarded as more difficult.
It is often difficult to ascertain the source of the bug, and if the source is found, it is not easy to determine who bears the responsibility, according to Miller.
Complicating matters, Mexico's oil output has slipped to 2.55 million barrels a day from a peak of 3.4 million in 2004, as easy oil in the Gulf is replaced by more difficult reserves of deep-water oil and heavy oil onshore.
The art and science of medicine is not in picking the easy cases, it is in determining the difficult ones.
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Oh, and finding another job is not going to be easy with getting your CRD cleared because those procedures have become time consuming, complicated and difficult to navigate without the help of an attorney.
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Most travel sites find it relatively easy to sell airfares, hotel accommodation and car hire online, but packages have proved more difficult.
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