It may be chronological, a logical series of topics progressing from the general to the specific, or alphabetical, as in indexes, encyclopedias, and glossaries. Straight sequences are most appropriate for training sites. More complex sites may still be organized in a logical sequence, but each page in the main sequence may have links to one or more pages of digressions, parenthetical information or other information on other sites. Grids Procedural manuals, lists of university course, and medical case descriptions are best organized as a grid. To be successful, the individual units in a grid must share a highly uniform structure of topics and subtopics and the audience must understand the nature of the overall structure.
Grids have no particular hierarchy of importance.
Grids can be hard to follow unless users recognize the interrelations among categories of information. Grids are best suited for experienced audiences with some understanding of the topic and its logical organization. Most websites depend on hierarchies The home page presents a general overview of the site, with increasingly specific submenus and content pages as you move down through the site. Chunks of information should be ranked in importance and organized by the interrelations among units. Hierarchical diagrams are very familiar in corporate and institutional life, so most users find this structure easy to understand.