As a psychology student, I thought this would be good investment although I was a little concerned about how such a small book could be of use on such a broad topic. I have used this dictionary a number of times to check if it had what I thought were some fairly detailed words - and I was wonderfully surprised to find them every time. I find the defintions to be sufficiently detailed every time - either giving you enough information to jolt your memory on the topic or enough information to know where to look up for detail in the large text books.