If your referring to the thesis statement of your paper, the best thing do is first set up a primary question that you want to answer and then select the three topics that you are going to cover. Once you have covered your three topics that you want to discuss in your paper then you will be able to set up your thesis statement based on what your wrote in your paper. As for your question its a tad to broad and so you need to tighten it up a bit and so you could rephrase your question this way:
what are the negative and positive effects of modern computer technology in schools?
what are the negative and positive effects of modern computer technology in automobiles?
what are the negative and positive effects of modern computer technology with social networking?
With those questions your topic is a bit more focused and based on the information from any of those examples or whatever you want to focus on, it will help develop your thesis statement a bit better.
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