The nature of a case study is to understand the context in which God has placed you. Ministry is not abstract, it is real. People we meet are not abstract, but real. Issues in life are not abstract but real. The Word of God is not abstract and it itself is a result of the actual interaction between people and God. In those events, the meeting of the divine and the human, reality strikes. Real questions about living, interacting with people bumps up against the God who cares deeply for those He has created. He desires to listen to them (how many times does the OT reference God "hearing" his people in their pain?) and having compassion on them and helping them (deliverance is helpful). So, case studies force us to climb down out of our Theology and into the lives of people to first listen (thank you Jim) and then engage with them out of our understanding of God's Word and His love. It is solid, it is firm, and it is full of Spirit and Truth, which brings light to the blind and hearing to the deaf.
Ray was a believer in holistic ministry especially in relating Theology, Counseling and Practical Theology. Here is a an Article from the Journal of the Society for Christian Psychology that shows the interest in Ray's way of thinking.
Most of these case studies were used in Ray's Seminary courses as "exams." That should tell you something of the practicality he saw to ministerial preparations. Here is an example:
"An adult Sunday School class of a church in your city is beginning a series entitled, 'Relationships of Men and Women in the Bible,' and they have asked you to be a guest speaker for the first session. Of course, they want you to talk about Adam and Eve! Your next-door neighbor began attending that church a year ago, and you have noticed some problems developing in their relationship. The wife has become more passive and even depressed, while the husband seems to be caught up with the challenge to be the 'godly leader' of 'his home.' They have show interest in this series and you expect that they will attend. In considering the needs of the group, you realize that your first talk could have major implications for their evaluation of subsequent sessions. Taking this opportunity seriously, you decide to write out your view of male/female relationships based upon the biblical account of creation, also drawing upon relevant texts from the New Testament..." (see Speidell, pg 269-270)
Enjoy and let me know what you have written....