Information seeking involves a number of personal and environmental factors and processes. In this chapter we identify these factors and processes and see how they work together to define and constrain information seeking. Before reading further, stop and consider the many information-seeking activities you perform each day. Suppose you have a well-defined information need such as finding a phone number for a business in a foreign city. What do you need to know to begin? What things do you already know about telephones, businesses, and information seeking that will help in your search? What sources could help? How can you determine whether they are available? How do you use them? What are the costs in time or money? How will you know when you have found the correct number? What kinds of questions can you imagine for a more openended but better-focused information problem such as understanding the implications of the European Common Market's trade agreement with Japan on what investments to make for a child's college trust fund? How would your strategies differ for a fuzzy problem like gaining information to improve one's knowledge of a domain of interest? Clearly, we encounter many varieties of information problems and apply varied information-seeking strategies to solve these problems. To understand this variety, it is useful to have a framework that explicates factors and processes common to information seeking in general.