You are likely to be continuously modifying your topic throughout the research process. This depends on whether:
Broad Topic: Indiscipline and violence in schools
Narrower Topic: What are the causes of indiscipline and violence among secondary school students in Trinidad and Tobago?
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Narrow Topic: What are the strategies used by schools to meet the needs of autistic children?
Broader Topic: What are the strategies implemented by the Ministry of Education to provide educational services to special needs students?
If you are finding too much information, your topic may be too broad. Consider narrowing it by:
Smaller piece of the topic:
If you are not finding enough information, your topic may be too narrow. Consider broadening it by: