Economist Jonathan Portes assesses how well the government has implemented its controversial welfare reforms. The government describes the programme as "the most ambitious, fundamental and radical changes to the welfare system since it began".

When the Coalition came to power in 2010, welfare - not including pensions - was costing the country nearly £100 billion a year. Iain Duncan Smith, the secretary of state for work and pensions, was given the task of making work pay and - in so doing - taking millions of people off benefit and saving the country billions.

Influential figures from parliament, the civil service and one of Iain Duncan Smith's closest advisers offer revealing accounts of what's been happening during those past 4 years.

Economist Jonathan Portes asks whether these changes are a vital strategy to stem a welfare system spiralling out of control or - as some argue - nothing short of a fiasco, which has caused genuine hardship?

Producer: Adele Armstrong.

What is a caliphate? What ideals does such an Islamic state embody - and how could or should it be implemented? Analysis consults a range of voices to explore how the concept has evolved and has been expressed over the centuries. Edward Stourton talks to historians, religious scholars and political thinkers who offer their perspectives on caliphates of the past, the revivalist rhetoric of the present and the beliefs shared by many Muslims about its future return.

Contributors:

Presenter: Edward Stourton

Politicians love talking about supporting families. But, asks Jo Fidgen, do they understand modern family life? And how far can or should the state change the way families live? There's endless focus on young children and childcare, while family care for the elderly is rarely mentioned. She hears from policy insiders, those who have to define families to make their businesses work, individuals facing extraordinary challenges as family life changes with society and across the generations.

Producer: Chris Bowlby

Robert Peston tests the arguments made by the authors of a new book who claim the financial crisis was caused by exploding household debt - not by the banks. But are they right?

Now the BBC's Economics Editor, he witnessed at first hand every twist and turn of the financial crisis of 2007 and 2008. He first exposed the crisis at Northern Rock as well as revealing the failure of Lehman Brothers. This makes him the ideal interviewer to probe the arguments and conclusions of "The House of Debt", a radical new study of the recession and the lessons to be learnt from it. In discussion with the book's authors, Atif Mian and Amir Sufi, he subjects their arguments to rigorous scrutiny.

They challenge the conventional wisdom that the banks were to blame for the recession in the US and UK. They argue that the real villain was the doubling between 2000 and 2007 in total American household debt to $14 trillion. Much of this was owed by borrowers with the poorest credit ratings. When the house price bubble burst and incomes also fell, these households suddenly stopped spending and plunged the US economy into deep recession.

By this argument, the banks weren't the real problem. And yet, thanks in large part to their lobbying power, they received help which would have been better directed at helping indebted households. If correct, this means governments and central banks should fundamentally reappraise how they tackle future downturns, focusing much more on households and much less on bankers. For many, this may sound highly attractive. But does the new analysis pass muster with Robert Peston?

Producer Simon Coates.

What should we eat? Jo Fidgen talks to the influential American writer Michael Pollan about what food is - and what it isn't. In an interview before an audience at the London School of Economics and Political Science he criticises the way the food industry has promoted highly-processed products delivering hefty doses of salt, sugar and fat. He believes that the plethora of accompanying health claims have left us more confused than ever about what food really is, where it has come from and its impact on our health and the environment. His solution? To cook at home. He argues that this simple change will guarantee a healthy diet and stop us relying on big food companies to feed us. It is also, he says, a profoundly political act. But is it a realistic proposition for busy working families or simply a middle-class ideology?

Producer: Sally Abrahams.

The downturn's made everyone worry more about money. But while we may want to be thriftier, Chris Bowlby discovers why we're stuck with high levels of personal and household debt. Credit has become a way of life and new technology makes it ever more accessible. We know we ought to save more for, say, old age, but pensions seem distant and a dodgy investment, while the government and others are desperate to encourage revived consumer spending . Borrowing to buy houses seems to many the best financial bet. Is there an alternative approach out there?

A wide range of voices from different communities explore the mixture of hard financial fact, psychology and morality that's shaped our financial behaviour in such a turbulent few years.

Producer: Chris Bowlby

Something strange has been happening in the British economy. For over six years now, wages have fallen for most of us, which is unprecedented in British modern history. And despite the return of economic growth, wages still have not picked up.

What has happened? And crucially is this a long term problem - is this the end of the pay rise? Paul Johnson, director of the Institute for Fiscal Studies, explores the mystery of our falling wages and finds out how it is related to how productive we are, but also to how wages themselves are shared out between the top earners and the rest of us.

Producer: Estelle Doyle

Contributors:

Why have the Tories attracted the label 'the nasty party'? Tory supporter Robin Aitken explores why the phrase took hold, and why it matters in key national debates today. Senior and influential figures in the Tory party's recent history offer revealing personal accounts of what they believe and how the party is perceived by the outside world.

What is the best form of capitalism? The free-market form found in countries such as the UK and the United States, or the more collaborative model which is common across Northern Europe?

Some British politicians, from both the left and right, are somewhat starry-eyed when it comes to the way other countries run their economy and have even suggested the UK could improve its lot by importing practices found across Scandinavia and Germany. But is that remotely possible?

In this edition of Analysis, Britain politics correspondent for The Economist Jeremy Cliffe investigates the different forms of capitalism defined by the Varieties of Capitalism school - most-famous for the book of the same name published in 2001.

He begins by working out what makes a 'Liberal Market Economy' and a 'Coordinated Market Economy', and then digs deeper to find out how these different models formed in the first place.

He discovers a deep web of intertwined government institutions which have been shaped over decades and centuries by each individual country's culture. It turns out that transplanting a different way of doing things from one country to another is just not that simple - but does that mean politicians should just give up trying to do something different?

Producer: Richard Fenton-Smith.

There's a new government in Kiev and Crimea is firmly in Russian hands. The political map of eastern Europe has changed dramatically in the last few months. But are Moscow's actions in the Ukraine crisis evidence of a long-term strategy to reassert Russia as a world power? Or are they the actions of a weakened government scrabbling to keep up with events?

Edward Stourton investigates whether Vladimir Putin, former KGB Colonel and holder of a black belt in Judo, is playing a strategic game of chess , or just a high-stakes game of poker.

Contributors:

Anne Applebaum, historian

Producer: Luke Mulhall.