If you're getting paid to do something, you should do it, and do it well. But is it always that simple? What if you have a vague job description, a haphazard workload, and a very strict boss who is only content when you look busy, and doesn't realize or care that you are so efficient that you completed your work early.
Let's say you and a co-worker must each enter the data from 100 files, or shelve 100 books. You hustle and finish an hour earlier than your co-worker, and there's not much else to do. Your boss or manager walks by, expresses displeasure at the fact that you're not doing anything, and assigns you to an unpleasant, and really unnecessary task because they don't like seeing you relax (even though you earned it by finishing your assignment faster, right?). What do you do? Quit? File a complaint? Or slow down? These instructions are here for if you decide to reward your own efficiency by using that extra time you earned for R&R--without your boss noticing.
Know what the standards are. At the end of the day, you still have to meet those standards if you want to keep your job. The main thing you should know is how much time your manager or boss expects you to spend on a particular project or assignment. Spend that amount of time on it--no more, no less (unless, of course, efficiency is actually rewarded in your position, not punished). If, for example, your boss expects you to spend 40 minutes on a task but you know you can get it done in 20 minutes, you should be able to sprinkle another 20 minutes of "fun time" in (broken up into 3-5 minute intervals) and still get the job done in have a totally clean desk. Fill your work area with several projects that you are in the process of doing (or not doing, as the case may be). Cover your desk with open binders, highlighted reports, and sticky notes all over the place—make your workspace look like a war zone. Remember to keep your wastebasket full, too, preferably with work-related debris. A good boss will see right through this, but your mean boss will be content to see you look busy (because it makes them look like a good manager). Ask a lot of questions. Think up complex questions about tasks you have to do and ask them of your boss or coworkers. Ask questions frequently enough and everyone will think you’re really wrapped up in whatever task you're asking about. Be careful what questions you ask, though, you don’t want to sound incompetent.
Open some of the applications you normally use for work and have them visible on your computer’s desktop. The applications, of course, vary depending on the nature of your work. For example, if your task is data entry, you should have one or more databases up and running.
Make a decoy screen. For a good catch-all, open a couple programs that you use daily. Make sure that all are visible and fill up your screen so you look busy. Then, take a screen shot using the "Print Scrn" button, open MS Paint, paste the image in, then save and set that image as your desktop background. You may also want to hide most of your desktop icons, as this could be a dead giveaway. Even if your computer is on the desktop, it'll look as if you are deep into work! Here's another decoy: Next time you install a program, take a screenshot with the "installing" window. Make it your wallpaper when you need to leave the office so passers-by will think you’re just waiting for the installation to finish.
Scribble furiously. You may be making your shopping list or other personal notes, but to watching eyes it looks like you're throwing down ideas for the awkwardly scheduled end-of-day meeting.
Be alert. Not working is like playing a sport or game. You’ve got to always be on your toes and ready for anything. Try to anticipate your opponent’s next move — for instance, does your boss always stop by at certain times? Pay attention to audible clues (if you hear footsteps approaching, a chair creaking, or a flourish of activity nearby, it could mean trouble).
Watch out for Big Brother. Most large companies now monitor their employees’ computer usage. Learn about your company’s policies on internet usage, and learn about their monitoring efforts (it helps to make friends with someone in the IT department). If you can’t run afoul of the company’s policies without making sure you won’t get caught, don’t risk it.

On the front line, there are free programs you can install, called "virtual desktops", that will allow you to have two active desktops on your computer (one for work, one for play) that you can switch between at the touch of a key when you hear the pitter-patter of supervisory feet. You can also defeat this sort of monitoring by positioning your computer in such a way as to block someone else’s view of the screen (blame the unusual positioning on glare or ergonomics, if you need to explain it). Sneakier IT personnel, who monitor usage on the backend, are harder to fool. Use proxies to surf the web, or use cached Google pages of a website instead of going directly to the site. There are also a variety of programs you can get (many for free) specifically designed to help you avoid detection. Search for them on the internet. When surfing the web, even with a proxy or cached pages, never delete parts of your history. Most IT loggers will see the sites deleted, and even if the logger logs every site visited, the techie will most likely not look meticulously at every site viewed. It just makes you look suspicious.

Have lengthy personal conversations away from your work space. Remember: There's nothing wrong with a little personal chit-chat between colleagues -- in fact, many managers encourage camaraderie among staff members -- but if you yearn to discuss a sporting event, your weekend or any other non-work topic in length while you are at work, find someplace other than your desk to do it. One good option is to book a pretend meeting with a friend (so you appear busy on your email calendar). Book a conference room while you're at it so you have a private space to talk. (Note: Don't try this too often, and in general try not to be seen too often with any one friend or people will know what you're up to.) Visit friends in different departments, leaving your workspace very "busy" looking. However, make sure that you have a work-related topic to initiate the conversation and return to if a supervisor walks by. For instance, tell the person next to you that you are going to double check something with someone from a different department. What you're really doing is providing yourself with an excuse if your boss wonders where you were for a little while. "Oh, didn't tell you? I wanted to double check and make sure both of our departments were on the same page about the new ad campaign, I know it's an important issue and I would hate to have any mix-ups."
Drink lots of water. Not only is water good for your health, it makes you have to use the bathroom a lot. Bathroom trips can take up a lot of time and are a legitimate way to waste time while still looking busy.
Make personal phone calls away from your work space. We all know someone at work who makes or takes too many personal phone calls. You don't want to be known as that person, because people will assume that you are generally a slacker. When you need to make appointments or just want to chat with a friend on the phone, find a phone away from your work space. Your best bet is to use a phone in a conference room. Make sure the conference room hasn't been reserved by someone else (either reserve it yourself or wait until 5 or 10 minutes after the hour to use the room). Bring paperwork and a pen with you and jot down the occasional note, so that people walking by the room assume that you are on a work call. If the room has a conference speaker phone, use it, but make sure the door to the room is closed. To passersby, a conversation on a conference phone = a work call. Oh, and keep your feet on the ground: if you prop your feet on a table or chair in the conference room, all of your other planning will be wasted because it will be obvious to people walking by that you aren't working. Remember, your goal is to look like you are working even when you're not.
Always, always carry a backup prop. If you’re going to be away from your desk doing something other than work, carry a document you might have been reading with you. It's best if it's a "long term project" that you can convincingly say you were finally getting to. If you are planning to sneak out of the office for an errand that requires your car, your backup prop should be a folder or large envelope. This way you can surreptitiously carry your car keys out of the office. Your best bet is to plan ahead on this one: when you get to work, immediately place your car keys in a folder/envelope, along with other papers. Then, when you are ready to sneak out of the office, just grab the folder and go. If you have to dig for your keys, the tell-tale jingle will give you away. Send mail to yourself. Opening mail that was sent to you by you can help waste many minutes as you open, inspect and read the contents. If you feel that money is not an issue, a FedEx (USA) overnight envelope with signature required (pad it) will allow you the opportunity to open an "important" document and spend hours reviewing (and of course package more fun stuff and sending out). Be sure to double envelope the "documents" and mark "confidential" on the inner envelope. Try Excel based games. There are a plethora of excel based games that will not require any programme installations, even if your PC is monitored for programmes used, it would report usage of excel which will not be bad in any case. just keep the volumes under check.
Read a book. There are a lot of books available in PDF format, and are available for free. Just remember to do some faux typing or paper shuffling while you are intently gazing at your computer screen.
Go to the Cafeteria to check the Lunch menu. Make a few short trips to the Cafeteria to check on that days Lunch menu. This is a legitimate reason to leave your desk and you may run into a co-worker for additional conversation and to consume more time. Start looking for a new job. Regularly not having enough work to do can be a damper and result in low morale particularly for the career focused individual, in such instances it would make more sense looking for interesting work elsewhere rather than continuing the daily charade of pretending to be busy.