This article describes some of the issues confronting research workers who want to carry out research on the effects of"access structures" -devices which enable people to gain access to a text (such as summaries, headings, and numbering systems). Although this paper focusses specifically on the role of headings, two general points can be made: (1) the literature on any access structure is diffuse and inconclusive and (2) some order may be gained from the chaos by carrying out a series of systematic studies which replicate and build upon themselves. A third, more contentious, point is that we need descriptive and a-theoretical studies first in order to clear the ground for later theoretical work.This article presents the results from seventeen experiments on headings which illustrate these points. The first nine experiments centre on three main variables, (1) the position of headings (marginal or embedded); (2) the form of headings (statements or questions); and (3) the nature of the task (free recall, searching unfamiliar text, and retrieval from familiar text). The results showed that the position of the headings (marginal or embedded) had no effect, but that headings in either form aided the recall, search and retrieval of information from the text used in these experiments with 14-15 year old participants.These experiments were then replicated using a different text in a further four experiments with 1 1-12 year old participants. These experiments showed that headings aided l 1-12 year old's search and retrieval but not their recall from this second text. However, an additional study with 14-15 year olds and the second text showed that headings again aided recall with this groupsuggesting a developmental trend in children's capacity to use headings as recall devices. Finally, another three experiments tested whether headings in the form of questions helped lower-ability readers more than headings in the form of statements (a hypothesis which had emerged from both the preceding and other earlier studies conducted by the authors). In these three studies, however, no significant differences were found to result from the different forms of heading. 0020 4277/85/$ 03.30