{"id":2525,"date":"2013-07-06T15:09:35","date_gmt":"2013-07-06T08:09:35","guid":{"rendered":"http:\/\/science-technology.vn\/?p=2525"},"modified":"2013-07-06T15:09:35","modified_gmt":"2013-07-06T08:09:35","slug":"cach-do","status":"publish","type":"post","link":"https:\/\/science-technology.vn\/?p=2525","title":{"rendered":"C\u00e1ch \u0111o"},"content":{"rendered":"

T\u00f4i nh\u1eadn \u0111\u01b0\u1ee3c m\u1ed9t email t\u1eeb m\u1ed9t sinh vi\u00ean: \u201cT\u1ea1i sao ch\u00fang ta ph\u1ea3i \u0111o c\u00f4ng vi\u1ec7c c\u1ee7a m\u00ecnh? \u0110o l\u00e0 kh\u00f3 v\u00e0 ph\u00ed th\u1eddi gian v\u00ec n\u00f3 kh\u00f4ng cung c\u1ea5p cho t\u00f4i gi\u00e1 tr\u1ecb. N\u1ebfu ch\u00fang ta c\u00f3 l\u1ed7i, ch\u00fang ta c\u00f3 th\u1ec3 s\u1eeda ch\u00fang v\u1ec1 sau b\u1ea5t k\u1ec3 ch\u00fang c\u00f3 bao nhi\u00eau. T\u00f4i kh\u00f4ng bi\u1ebft t\u1ea1i sao ch\u00fang ta c\u1ea7n \u0111o?”<\/span><\/p>\n

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C\u00e2u tr\u1ea3 l\u1eddi c\u1ee7a t\u00f4i: Ch\u00fang ta d\u00f9ng vi\u1ec7c \u0111o h\u00e0ng ng\u00e0y v\u00e0 ch\u00fang ta th\u01b0\u1eddng qu\u00ean m\u1ea5t gi\u00e1 tr\u1ecb ch\u00fang cung c\u1ea5p cho ch\u00fang ta. Khi b\u1ea1n \u0111i xe m\u00e1y, b\u1ea1n c\u00f3 xem \u0111\u1ed3ng h\u1ed3 ch\u1ec9 x\u0103ng \u0111\u1ec3 ch\u1eafc r\u1eb1ng b\u1ea1n c\u00f3 \u0111\u1ee7 x\u0103ng tr\u00ean ch\u1eb7ng \u0111\u01b0\u1eddng l\u00e1i \u0111i xa kh\u00f4ng? Trong khi tu\u00e2n theo c\u00f4ng th\u1ee9c n\u1ea5u b\u1ebfp, b\u1ea1n c\u00f3 \u0111o kh\u1ed1i l\u01b0\u1ee3ng c\u00e1c ch\u1ea5t li\u1ec7u nh\u01b0 mu\u1ed1i tr\u01b0\u1edbc khi th\u00eam v\u00e0o th\u1ee9c \u0103n kh\u00f4ng? B\u1ea1n c\u00f3 ki\u1ec3m th\u1eddi gian b\u1eb1ng vi\u1ec7c nh\u00ecn v\u00e0o \u0111\u1ed3ng h\u1ed3 kh\u00f4ng? \u0110\u1ea5y l\u00e0 nh\u1eefng c\u00e1ch \u0111o b\u1ea1n d\u00f9ng m\u1ecdi l\u00fac. Kh\u00f4ng c\u00f3 kh\u00e1c bi\u1ec7t trong \u0111i\u1ec1u b\u1ea1n l\u00e0m trong cu\u1ed9c s\u1ed1ng h\u00e0ng ng\u00e0y v\u00e0 d\u1ef1 \u00e1n ph\u1ea7n m\u1ec1m: B\u1ea1n \u0111o ti\u1ebfn b\u1ed9 c\u1ee7a m\u00ecnh \u0111\u1ec3 cho b\u1ea1n bi\u1ebft b\u1ea1n l\u00e0m t\u1ed1t \u0111\u1ebfn \u0111\u00e2u v\u00e0 n\u1ebfu c\u00f3 v\u1ea5n \u0111\u1ec1 th\u00ec b\u1ea1n ph\u1ea3i s\u1eeda ch\u00fang. T\u00f4i kh\u00f4ng bi\u1ebft t\u1ea1i sao nhi\u1ec1u ng\u01b0\u1eddi kh\u00f4ng ch\u00fa \u00fd t\u1edbi vi\u1ec7c \u0111o khi n\u00f3 l\u00e0 m\u1ed9t ph\u1ea7n l\u1edbn trong cu\u1ed9c s\u1ed1ng h\u00e0ng ng\u00e0y c\u1ee7a h\u1ecd?<\/p>\n

N\u1ebfu b\u1ea1n kh\u00f4ng nh\u00ecn v\u00e0o \u0111\u1ed3ng h\u1ed3 \u0111o x\u0103ng khi l\u00e1i xe m\u00e1y th\u00ec \u0111i\u1ec1u g\u00ec l\u00e0 ho\u00e0n c\u1ea3nh khi b\u1ea1n ch\u1ea1y h\u1ebft x\u0103ng? B\u1ea1n c\u00f3 ti\u1ebfp t\u1ee5c \u0111i \u0111\u01b0\u1ee3c kh\u00f4ng n\u1ebfu \u0111\u1ed3ng h\u1ed3 x\u0103ng ch\u1ec9 cho b\u1ea1n l\u00e0 b\u1ea1n kh\u00f4ng c\u00f3 \u0111\u1ee7 x\u0103ng trong xe m\u00e1y? T\u01b0\u1edfng t\u01b0\u1ee3ng r\u1eb1ng b\u1ea1n n\u1ea5u c\u00e1i g\u00ec \u0111\u00f3 v\u00e0 c\u1ee9 \u0111\u1ed5 mu\u1ed1i v\u00e0o trong n\u00f3 m\u00e0 kh\u00f4ng \u0111o g\u00ec c\u1ea3? M\u01b0\u1eddi hay hai m\u01b0\u01a1i th\u00eca mu\u1ed1i l\u00e0 t\u1ed1t h\u01a1n hay ch\u1ec9 hai th\u00eca th\u00f4i? T\u00f4i ch\u1eafc ch\u1eafn trong tr\u01b0\u1eddng h\u1ee3p \u0111\u00f3, b\u1ea1n c\u00f3 th\u1ec3 ph\u1ea3i u\u1ed1ng nhi\u1ec1u n\u01b0\u1edbc sau \u0111\u00f3 v\u00ec th\u1ee9c \u0103n c\u1ee7a b\u1ea1n c\u00f3 qu\u00e1 nhi\u1ec1u mu\u1ed1i trong \u0111\u00f3.<\/p>\n

N\u1ebfu b\u1ea1n ngh\u0129 vi\u1ec7c \u0111o l\u00e0 kh\u00f3 v\u00e0 ph\u00ed th\u1eddi gian th\u00ec b\u1ea1n s\u1ebd KH\u00d4NG \u0111i t\u1edbi b\u00e1c s\u0129 b\u1edfi v\u00ec b\u1ea1n ngh\u0129 \u00f4ng \u1ea5y c\u00f3 th\u1ec3 t\u00ecm ra c\u00e1i g\u00ec \u0111\u00f3 sai v\u1edbi th\u00e2n th\u1ec3 b\u1ea1n? B\u1ea1n s\u1ebd KH\u00d4NG nh\u00ecn v\u00e0o \u0111\u1ed3ng h\u1ed3 b\u1edfi v\u00ec n\u00f3 c\u00f3 th\u1ec3 cho b\u1ea1n bi\u1ebft r\u1eb1ng b\u1ea1n b\u1ecb mu\u1ed9n gi\u1edd l\u00ean l\u1edbp? B\u1ea1n s\u1ebd KH\u00d4NG ki\u1ec3m xem m\u00ecnh c\u00f3 bao nhi\u00eau ti\u1ec1n khi b\u1ea1n m\u1eddi b\u1ea1n g\u00e1i \u0111i xem phim? B\u1ea1n bao gi\u1edd c\u0169ng \u0111o c\u00e1i g\u00ec \u0111\u00f3 ph\u1ea3i kh\u00f4ng? B\u1edfi v\u00ec b\u1ea1n c\u1ea7n \u0111i\u1ec1u \u0111\u00f3 \u0111\u1ec3 ra quy\u1ebft \u0111\u1ecbnh \u0111\u00fang. N\u1ebfu b\u1ea1n kh\u00f4ng c\u00f3 \u0111\u1ee7 x\u0103ng th\u00ec b\u1ea1n ph\u1ea3i t\u1edbi tr\u1ea1m x\u0103ng \u0111\u1ec3 r\u00f3t \u0111\u1ea7y b\u00ecnh tr\u01b0\u1edbc khi v\u00e0o cu\u1ed9c h\u00e0nh tr\u00ecnh. N\u1ebfu b\u1ea1n kh\u00f4ng c\u00f3 \u0111\u1ee7 ti\u1ec1n th\u00ec b\u1ea1n c\u00f3 th\u1ec3 \u0111i ra ng\u00e2n h\u00e0ng \u0111\u1ec3 r\u00fat ti\u1ec1n hay vay c\u1ee7a b\u1ea1n b\u00e8 m\u00ecnh tr\u01b0\u1edbc khi t\u1edbi nh\u00e0 b\u1ea1n g\u00e1i \u0111\u1ec3 m\u1eddi c\u00f4 \u1ea5y \u0111i xem phim. C\u00e1ch \u0111o l\u00e0 ch\u1ec9 b\u00e1o cho b\u1ea1n bi\u1ebft t\u00ecnh hu\u1ed1ng n\u01a1i b\u1ea1n c\u00f3 th\u1ec3 c\u00f3 h\u00e0nh \u0111\u1ed9ng \u0111\u00fang \u0111\u1eafn.<\/p>\n

C\u00f3 ch\u01b0\u01a1ng tr\u00ecnh \u0111o cho d\u1ef1 \u00e1n c\u1ee7a b\u1ea1n l\u00e0 quan tr\u1ecdng. N\u00f3 gi\u00fap cho b\u1ea1n ki\u1ec3m \u0111\u01b0\u1ee3c ti\u1ebfn b\u1ed9 c\u1ee7a m\u00ecnh, n\u00f3 cho b\u1ea1n bi\u1ebft b\u1ea1n \u0111ang l\u00e0m t\u1ed1t hay t\u1ed3i cho n\u00ean b\u1ea1n c\u00f3 th\u1ec3 s\u1eeda ch\u1eefa n\u00f3 tr\u01b0\u1edbc khi qu\u00e1 mu\u1ed9n. T\u1ea5t nhi\u00ean, n\u1ebfu b\u1ea1n c\u00f3 l\u1ed7i th\u00ec b\u1ea1n ph\u1ea3i s\u1eeda ch\u00fang nh\u01b0ng \u0111i\u1ec1u g\u00ec s\u1ebd x\u1ea3y ra n\u1ebfu b\u1ea1n KH\u00d4NG c\u00f3 \u0111\u1ee7 th\u1eddi gian b\u1edfi v\u00ec b\u1ea1n kh\u00f4ng \u0111o th\u1eddi gian? \u0110i\u1ec1u g\u00ec s\u1ebd x\u1ea3y ra khi b\u1ea1n kh\u00f4ng s\u1eeda m\u1ed9t l\u1ed7i t\u1eeb s\u1edbm v\u00e0 n\u00f3 t\u00edch lu\u1ef9 qua th\u1eddi gian t\u1eeb m\u1ed9t l\u1ed7i th\u00e0nh m\u1ed9t tr\u0103m l\u1ed7i? Bao nhi\u00eau ng\u01b0\u1eddi trong c\u00e1c b\u1ea1n \u0111i trong r\u1eebng kh\u00f4ng c\u00f3 la b\u00e0n? Bao nhi\u00eau ng\u01b0\u1eddi trong c\u00e1c b\u1ea1n \u0111i kh\u00f4ng c\u00f3 b\u1ea3n \u0111\u1ed3? B\u1ea1n \u0111\u00e3 bao gi\u1edd nghe th\u1ea5y n\u00f3i \u201cN\u1ebfu b\u1ea1n kh\u00f4ng bi\u1ebft b\u1ea1n \u0111ang \u1edf \u0111\u00e2u, b\u1ea3n \u0111\u1ed3 s\u1ebd kh\u00f4ng \u00edch g\u00ec.\u201d C\u00e1ch \u0111o l\u00e0 nh\u1eefng \u0111i\u1ec1u gi\u00fap cho b\u1ea1n qu\u1ea3n l\u00ed d\u1ef1 \u00e1n c\u1ee7a m\u00ecnh v\u00ec ch\u00fang cho b\u1ea1n bi\u1ebft khi n\u00e0o b\u1ea1n ph\u1ea3i l\u1ea5y h\u00e0nh \u0111\u1ed9ng s\u1eeda ch\u1eefa.\u00a0 Kh\u00f4ng ai mu\u1ed1n b\u1ecb l\u1ea1c v\u00e0 kh\u00f4ng ai mu\u1ed1n nh\u1eadn \u0111\u01b0\u1ee3c ph\u1ea7n m\u1ec1m \u0111\u1ea7y l\u1ed7i.<\/p>\n

 <\/p>\n

—-English version—-<\/p>\n

 <\/p>\n

Measurements<\/p>\n

I received an email from a student: \u201cWhy do we have to measure our work? Measurement is difficult and it is a waste of time as it provides no value to me. If we have defects, we can fix them later regardless how many of them. I do not know why we need measurement?”<\/p>\n

 <\/p>\n

My answer: We use measurements every day and we often forget the value they provide to us. When you ride your motorcycle, do you watch the gas-meter to make sure that you have enough gasoline to go for a long drive? While following a cooking recipe, do you measure the amount of ingredients such as salt before adding to your food?\u00a0 Do you check the time by looking at your watches? Those are measurements that you use all the time. There is no difference in what you do in your daily life and the software project: You measure your progress to let you know how well you are doing and if there are problems then you must fix them. I do not know why so many people do not pay attention to measurement when it is so much a part of their daily life?<\/p>\n

If you do not look at your gas-meter when riding your motorcycle then what is the chance that you run out of gas? Would you continue to go if the meter indicates that you do not have enough gas in your motorcycle? Imagine that you cook something and just pouring salt into it without any measurement? Would ten or twenty teaspoons of salt are better than just two teaspoons? I am sure in that case, you may have to drink a lot of water afterward as your food has so much salt in it.<\/p>\n

If you think measurement is difficult and a waste of time then would you NOT go to the doctor because you think he may find something wrong with your body? Would you NOT look at your watch because it may tell you that you are late to class? Would you NOT check to see how much money you have when you ask your girlfriend to go to a movie? You always measure something don\u2019t you? Because you need it to make correct decision. If you do not have enough gas then you must go to the gas station to fill up the tank before go on the trip. If you do not have enough money then you may go to your bank to withdraw money or borrow your friend before go to your girlfriend \u2018s house to ask her to go to the movies. Measurement is the indicator to let you know the situation where you can take correct action.<\/p>\n

Having a measuring program for your project is important. It help you to check your progress, to let you know how good or how bad that you are doing so you can correct it before it is too late. Of course, if you have defects than you must fix them but what will happen if you do NOT have enough time because you do not measure the time? What will happen when you did not fix a defect early and it accumulates over time from one defect to hundred defects? How many of you would travel in the forest without a compass? How many of you would travel without a map? Have you ever heard the saying \u201cIf you do not know where you are, a map will not help\u201d. Measurements are things that help you to manage your project as they let you know when you should take corrective actions.\u00a0 No one want to get lost and no one want to receive software full of defects.<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

T\u00f4i nh\u1eadn \u0111\u01b0\u1ee3c m\u1ed9t email t\u1eeb m\u1ed9t sinh vi\u00ean: \u201cT\u1ea1i sao ch\u00fang ta ph\u1ea3i \u0111o c\u00f4ng vi\u1ec7c c\u1ee7a m\u00ecnh? \u0110o l\u00e0 kh\u00f3 v\u00e0 ph\u00ed th\u1eddi … <\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24],"tags":[],"class_list":["post-2525","post","type-post","status-publish","format-standard","hentry","category-quan-li-du-an"],"_links":{"self":[{"href":"https:\/\/science-technology.vn\/index.php?rest_route=\/wp\/v2\/posts\/2525","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/science-technology.vn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/science-technology.vn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/science-technology.vn\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/science-technology.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2525"}],"version-history":[{"count":1,"href":"https:\/\/science-technology.vn\/index.php?rest_route=\/wp\/v2\/posts\/2525\/revisions"}],"predecessor-version":[{"id":2526,"href":"https:\/\/science-technology.vn\/index.php?rest_route=\/wp\/v2\/posts\/2525\/revisions\/2526"}],"wp:attachment":[{"href":"https:\/\/science-technology.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2525"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/science-technology.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2525"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/science-technology.vn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2525"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}