Sequential Access: UX Definition. If you happened to be around in the 9. Somewhat like traveling by a Star Trek transporter instead of driving along the freeway and passing the exits one at a time, which is what you get with sequential access.)In a normal, physical book, the reader is supposed to read pages one by one, in the order in which they are provided by the author. For most books (fiction, at least), it makes little sense for the reader to turn directly page 2. Unless, of course, that is where the reader left off in their last reading session. Getting to page 2. Tables of contents try to alleviate a book. The difference between the various types of. Evaluating Cache and Disk Usage by Applications Random and Sequential Data Access. For workloads of either random or sequential I/O. Architecture and components of Computer System Memory Classification IFE Course In Computer Architecture Slide 1 With respect to the way of data access we can. What is the difference between storage and memory? The user still has the problem of turning to the desired page number, but at least he doesn. Thus, it is disappointing to see sequential- access designs becoming increasingly popular nowadays. Costs and Benefits of Sequential Access. But why is sequential access so bad? Simply because it forces the user to work harder than she needs to: she has to process all the content that sequentially precedes the piece of information that she is interested in. Thus, sequential access increases interaction cost. Sequential access increases interaction cost: the user has to inspect all the items that precede the item of interest in a list. With direct access, the user can focus on the element of interest without explicitly processing the items that come before it in the list. Sequential access has two potential benefits: Progressing linearly through an information space can be accomplished through particularly simple navigation controls: basically a . However, designs like infinite scrolling often hurt users more than they help. You ought to design navigation controls that allow users more freedom without being overly complicated. If you know that users have been through the earlier steps in a sequence, you can build on that knowledge in explaining the next step. In practice, of course, users often scan verbose web pages and miss much of the information. In contrast, the costs are very real and are incurred every time. Examples of Sequential Access in User Interfaces. Let. As a result they often forewent vertical scrolling in favor of a card or carousel- like design.)Carousels have many advantages, but one big disadvantage is that they are based on sequential access: users must go through all the items in the carousel one by one in order to get to the last one. This interaction is inefficient and provides little information scent: users generally have no information about what comes next. Although carousels may solve content- priority quarrels within the organization, they slow users down (at least in their more traditional incarnations) . How can you make carousels more direct- access like? RAM: Stands for random access memory; refers to memory that the microprocessor can read from and write to. When you create something in memory. Serial Access (also known as. Direct Access (also known as 'random access). Know the difference between 'Serial' and 'Direct' data access. Lecture Outline Computer/Data Storage Technology. Information Technology in Business Lecture Outline. Random access memory (RAM) is the best known form of computer memory. The opposite of RAM is serial access memory. If you cannot avoid them altogether, provide links to the stories in the carousels to let people select them in any order or, at least, present more than one item at once. Food. 52. com: Carousel items can be accessed directly by clicking the titles to the right of the image. This design has a lower interaction cost than one with 1 story per screen. That means that the interaction will be sped up (to access item number 5, users will have to change the carousel once with 3 items per screen instead of 5 times with 1 item per screen). Also, remember that carousels are ok only for short lists: users should be able to get to the last item in the list in 3. Search results or long lists never belong in carousels; as one of our users put it, . That is why videos by themselves are not an ideal medium for instructional or informational content; although they can work great in conjunction with text, if they are the only method available to users, they are terribly inefficient. How can we fix them? Not all material needs to be in video format. If you provide a video, make sure that you also provide, if not a transcription, at least a detailed text summary that allows people to quickly scan the information for relevant details. Long Pages. With the advent of responsive web design, uncommonly long pages proliferate not only on mobile, but also on the desktop. A long page that contains a variety of content forces the user to scroll down with the hope that they will find something relevant. Yes, users scroll, but only if tempted by the promise of relevant content. If the page information is made of different, loosely related pieces of information, users have no way of knowing whether they must scroll for more or they should stop. They often err on the side of minimizing effort and stop before reaching a relevant piece of information. How to fix the issue? Avoid excessively long pages altogether. If you cannot, at least provide a mini- IA: a linked page table of contents at the top of the page or use accordions to do so (especially on mobile). The mini- IA (whether from accordions or jump links) will tell people what to expect on the page, it will allow them to form a mental model of the page, and will also facilitate direct access. Worldwildlife. org. The page has a mini- IA at the top in the large- screen version (left), but that mini- IA is unfortunately removed from the small- screen versions (right). Accessibility. Screen readers and keyboard- only navigation exemplify another one of the pitfalls of sequential access. These tools scan all the links on a page in a sequential manner. If the link of interest is somewhere in the middle of the link list, it may take forever to get to it and be able to select it. How can you improve the access to random content? Code your designs to include shortcut links such as Skip to Navigation and Skip to Content to decrease the interaction cost (and the overall working- memory load.)Digital Magazines. When i. Pad magazines first came around, they used to follow the physical- magazine mental model and eliminate all direct access and hyperlinks. Stories were referenced on the cover or in the table of contents, but they were not linked to. Luckily most publishers eventually realized that a lack of hyperlinks was a tremendous downside because it forced people to browse through stories as if they were using a paper version. How can we fix the issue? Use hyperlinks. Selection from a Long List on Mobile. On mobile devices we often encounter designs that favor selection versus typing; these designs are based on the assumption that typing is difficult with a small touchscreen keyboard. As a result, users are sometimes forced to select an alternative from a long list of items . It is indeed generally easier to select than to type, but not if you have to scroll a lot to find the item of interest. Allow people to type 1. Even though typing long words or phrases is painful, it. People can still select, but now from a list that has been considerably narrowed down to only a few alternatives. It forces users to accept your curated contribution and assumes that most users will be willing to do so. For works of fiction, many articles, or entertainment videos that assumption is accurate. If, on the other hand, people are likely to be unequally interested in all the content that you offer, use a direct access method to let them reach their goal faster.
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