Mostly, the contributors sort out these and related issues more than they try to prove or disprove the existence of psi phenomena. The reader can decide. There is also that impassable divide between those who find a good case-history the best kind of evidence and those who want statistics. The book requires minimal background in its subject. When technical terms are used, they are always explained.
Bibliographies are carefully prepared and appropriate.
This is probably not a book for those who have thought long and hard about philosophical issues and scientific methodology. Advanced scholars may wish for some distinctions that are not made. This book achieves its purpose, however, and the purpose was worth achieving.