For the Cockroach Theory you should be checking the video below.
Otherwise read on for the Cockroach Approach
Cockroach approach is an existing time tested socially relevant, culturally insensitive and popular way to find the best and leave the rest.
In my +2 (Indian System- that is 12th grade elsewhere- approximately) in all the Kerala state run schools we had this biology experiment as final laboratory examination question. I have see my sister’s great lament in verses on death of a cockroach she killed. She never became a surgeon. I heard from an American friend that they had rats to dissect for exam. That is more cruel than a “lesser” creature such as the cockroach. While some may also go to the extent to idolize and sanctify the creation. Near immortality of cockroach is very well depicted in the movie Wall E (Trailer below)
Cockroach is apparently the only creature that can survive even nuclear disasters, it is said that cockroach can decide when it wishes to die. Just like Bheeshma from Mahabhaaratha.
The question to address is why ? Why we were told to dissect a cockroach ?
This was one main reason why I changed my syllabus to CBSE from Kerala State Board since there is no dissection in CBSE. So much for ahimsa. On enquiry, I get this cockroach approach to education. This applies to all competitive fields in life too. The reasoning is that among all the student who dissect a cockroach there may arise one or two doctors/surgeons who may in future help serve humanity by saving human lives. For this reason, endless number of cockroaches were caught, fed, petted and brought to lab to score marks and get cremated. No activist will mourn over a killed cockroach. Because they are available in plenty. No shortage at all. This is what happens to all the equally educated/skilled students. There are so many of them. Why should anyone care about them. If they wish they can find their means to make sense of their life. The cockroach approach teaches the students these two important lessons. Quality and greatness can be sparked by working out in large numbers, here large number of student perform the same procedure, from where two great sparks may lead to produce two great doctors. This is exactly what I heard about the Chinese badminton team. Since there are so many players, the best among them. If you see the list on the BWF world ranking. You can easily find many Chinese players. It would be very easy for them to win many more matches than a lone wolf from another nation, since they may have faced tough competition in the Chinese national and local matches itself. Similar is the case in many other sports. Quality comes out from large numbers. The famed Edison is said to have discovered umpteen ways not to make an electric bulb before he did make a working one. Numbers play a major role. This is also illustrated in the book Outliers in terms of 10,000 hours rule for mastery. Hence, we can safely assume, that cockroach approach helps humanity to excel. Nevertheless, the cockroaches need to find elevation in being petted before dissection, before salvation by death.
I found some interesting cockroach approaches which are somewhat different from what is written above.