Just as above, it has been found that little 'specific' research to the positives of the father as a single parent has been done; however, there are various proven pros that accompany single parenting. One proven statistic about single fathers states that a single father tends to use more positive parenting techniques than a married father. As far as non-specific pros, a strong bond tends to be formed between parent and child in single-parenting situations, allowing for an increase in maturity and closeness in the household. Gender roles are also less likely to be enforced in a single parent home because the work and chores are more likely to be shared among all individuals rather than specifically a male or female. 
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Example 3: What are the special challenges that students who are born in Germany and have an immigrant background face?
Generally, this question can serve as basis for a qualitative study but it needs some further clarification. In Germany, we have immigrants from lots of different backgrounds: people from Turkey, Russia and the successor states of the former Soviet Union, Poland, successor states of the former Yugoslavia, Italy, Greece, etc. Some are Muslims, some are Catholics and others are atheists. And they came for different reasons: work, war, breakdown of communism or having German ancestors. Hence, it is to expect that each group faces different challenges. It is thinkable to design a study where all groups are included, but this would be very large and extensive qualitative research project. The advice here is to narrow the question to one particular group of immigrants.