IS KCL or UCL better for International Relations Master's programmes? Watch
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However, something to definitely consider is the type of programme you are looking for. An IPP is inherently different than an IR degree. IR at KCL is heavily focused on international theory (realism, liberalism, etc.) whereas an IPP may be more focused on policy formation and implementation (I don't know this programme, but I would recommend knowing the differences!). You may be able to take policy-driven optional courses at King's, but the IR core course is essentially IR theory (we all get to take 2 optional modules alongside our core, so there is definitely possibility here).
In terms of what programme is most well-regarded, I don't know that you can go wrong. I chose KCL specifically for the design of the Terrorism/Counterterrorism programme and for the international reputation of the War Studies department and as a student from the United States, I wanted to make sure people from back home would know the type of education I was receiving (KCL is one of the most well known in the US for anything intelligence/IR related). I would suggest choosing the programme that interests you most! I hope this was helpful.
With regards to the reputation and recognition of KCL’s War Studies department it is highly respected in terms of employment and it's academic research and teaching is internationally recognised. The professors are excellent and incredibly well read. Within the department there is a dedicated career advisor that sends us a weekly newsletters of all the upcoming career events and guest lectures that the department hosts alongside this we are informed of the latest internships and job openings in fields such as: development, security, defence and think tanks. From the networking events and career talks I have attended employers have respected the KCL degree and I have often found that they themselves undertook an MA in the War Studies department. This is a testament to the fact that the degree is well regarded in their respective fields. The high number of international students makes classes incredibly interesting as you gain new insights and understandings as well as challenging your misconceptions.This mix of international and British students gives the course a truly international feel. I think it also affirms this sense that the course is internationally respected as many of my peers will return to their respective home countries and seek employment.
While prestige and respect is a measure to decide your postgraduate degree I would also say that it is important to consider your areas of interest, look over the departmental teaching staff and the opportunities that the War Studies department has to offer in order to help make an informed decision. Perhaps attend an open day or email the department if you want to know more as they will be happy to answer your questions. Good luck deciding!