I look back on a few years of incredibly hard, but at the same time challenging, work.

The past year was indeed very challenging for the humanitarian community.

The science of complexity is probably the greatest challenge of all, greater than that of the very small on the left and the very large on the right.

Another maximum effort.

There's nothing wrong with big, crazy challenges.

And this is a challenge.

Breadth, balance and cohesion in the curriculum will be achieved through classroom learning experiences that are positive, challenging, stimulating and enjoyable.

The three month period since my last appearance before the Security Council has been a challenging one.

But deciphering the script is a very challenging task.

The real challenge then, is to try to figure out how we can change rules.

The selection of indicators has proven to be challenging.

If strategies to deal with those challenges are to be effective and successful, they have to be comprehensive in nature and address the root causes and negative consequences of the conflict.

It's a very challenging task. But more to come later.

Accordingly, the protection obligations of the United Nations were becoming increasingly challenging and complex.

This is really a business venture, one that addresses a very challenging segment of the market.

We recognize that this will be a challenging five month period, and we pledge our support and complete participation.

This happened at a time when ITC was supposed to respond vigorously to a number of major and challenging developments in the international trade environment.

Pool is geometry... in its most challenging form a science of precise angles and forces.

Every effort should be made by all States parties to contribute actively to building the knowledge base that will be conducive to the ability of the Conference to perform its most challenging functions.

That was challenging.

The Biodiversity Challenge

He said that there was a greater challenge ahead, the challenge of poverty, of climate change global challenges that needed global solutions and needed the creation of a truly global society.

Let me also pay tribute to your predecessor, Mr. Jean Ping, for his dedication and for the successful manner in which he conducted the work of the General Assembly at its fifty ninth session, which was an exceptionally challenging one.

In fact, it is a challenging concept for both developed and developing countries.

Production of the Treaty Series through the database was a particularly challenging aspect of the project.

Nonetheless, the Treaty had been subjected to very severe challenges.

Successful completion of the preparations for the summit is a challenging task for all of us.

So what would some of the specific challenges look like?

It is essential that the Secretariat be equipped to deal with the challenges that we, the Member States, have thrust upon it.

It's going to be very challenging to deal with.

I don't get enough challenge in this job.

Challenging gender based violence

Specific challenges related to indigenous peoples' development

At the best of times, traveling between Indonesia's many islands is challenging.

Determining an optimal level of accountability for results is also challenging.

That challenge could be met only if there was consensus on what the nature of the new Organization should be.

The year under review has been a challenging one for the United Nations, but the challenges have created an opportunity to debate change in the Organization.

This is challenging work to do.

Challenges and likelihood of achieving target

Global challenges and public administration

B. The nature of the emerging challenge

I wish to conclude by saying that the challenges faced by Africa are colossal, but the opportunities, means and resources to address those challenges are also immense.

Such cooperation should be based upon mutual respect and informed by the appreciation of historical and cultural diversities, as well as the specific challenges that might exist in each society.

In fact, some of them actually survived the Internet challenge, and some got even more repressive.

(c) Conduct of inspection and compliance missions, with a particular focus on the most challenging locations worldwide (40)