Eric Evans: Why do efforts to replace legacy systems fail?

Posted by Vijay on June 19, 2009 Leave a comment (0) Go to comments

Gojko Adzic has an interesting piece by Eric Evans about replacing legacy systems.

In summary, focus on the core domain – the part of the software that brings competitive advantage to the business – and use an anti-corruption layer to interface with the old system.

179 Total TweetBacks: (Tweet this post)

en: @ed80 that is messed up. Is that original or 80 video game? 07/12/09 06:46pm
en: @kurt_cagle So how many things are you juggling now? I'm just glad that they aren't chainsaws or firesticks... 07/12/09 06:46pm
en: @shanedawsonYes of course..or just tweet it hehe 07/12/09 06:46pm
eo: Or maybe m night shyamalan 07/12/09 06:46pm
en: @MorganSiegel88 well if rap music has taught me anything haha...damn did you get the wisdom yanked or did u take a one hopper to the face? 07/12/09 06:46pm
en: @mooooonpie huh? The church the club? Or the religious nut church? 07/12/09 06:46pm
en: umm so is there any other food besides crawfish @ 112 or is it cuz thats whats free?? lmao. i dont get down w tha crawdaddies like that... 07/12/09 06:46pm
en: @mitchelmusso are you gonna be with metro station august 4th or 5th?! pleasee reply!<3 07/12/09 06:46pm
en: @culturepreneur i love the smell of some sheesha,bt hate the fish smell! email on here or is fbk better? 07/12/09 06:46pm
en: What should i make tonight? Got wings or turkey nachos? 07/12/09 06:46pm
en: Liked "Money is the root of all evil – true or false?:" [pic] http://ff.im/-57Hyf 07/12/09 06:46pm
en: @almostwitty Can't you count the mile posts? Or don't they have those any more? 07/12/09 06:46pm
en: "is that your air conditioning, or are you playing gregg kowalski?" -- ahh new kranky release gets confused with my hvac. <3 07/12/09 06:46pm
en: RT @DjEv718 all artist hit me new mixtape coming up also I got a showcase sept 12 open slots avalible. Get at @djev718 or @hope718 07/12/09 06:46pm
en: @shanedawson YEA or you could tell me... right now.. ? okay fine just do a video. 07/12/09 06:46pm
en: @DJ_Gio hold on I been calln u for two days..no answer or call bak..nd u write diggy b4 u rite me...I'm calln my lawyer..its ova. 07/12/09 06:46pm
en: @Jonathan_Peace Lol, I hope it gave you a great, emotional scene. Or just a good cry. #writechat 07/12/09 06:46pm
en: @anne_nervig renee's having a baby! in 4 weeks, give or take. 07/12/09 06:46pm
en: @Chris_Hamp lmaooo i aint have breakfast or lunch i woke up @ 33 07/12/09 06:46pm
en: Today feels like a day where i play video games and write a song or two. 07/12/09 06:46pm
en: Feel free to call or come by for a visit. Also, run out and grab a Livestrong bracelet if you like. It would be a great show of support. 07/12/09 06:46pm
en: Sleepy....*yawn*...thinking about taking a nap or cleaning. 07/12/09 06:46pm
en: RT @SentientCincy its only when they kill or want to kill healthy animals that I become upset. There is no need 2 kill an animal 4 no reason 07/12/09 06:46pm
en: ughhh ; im getting tired of ma kick . Any |O1| selling a 'G1' or snoo even body selling |O1| ?! . Hit Me Up Pleaseeee . 07/12/09 06:46pm
en: @TGalante2 What a show I don't know what was better Lesners post fight wrestling taunting or watching Hendo send Bisping to Caicos. 07/12/09 06:46pm
sv: ...or at all. 07/12/09 06:46pm
en: Do you think this is real?!? Don’t Ever Delete A WoW-er’s Account… Or Else: http://ping.fm/e2I6N via @AddToAny @theoneinpink 07/12/09 06:46pm
en: RT self OK Americans, and esp those from Missourri. The St Pauls Sandwich. What??? Is this true or is Wikipedia making it up? http://bi ... 07/12/09 06:46pm
en: Why can't there be a twt.fm or blip.fm for BlackBerries or mobile in general? 07/12/09 06:46pm
nl: @erickimberlin Is Eeyore dead or just sleeping? 07/12/09 06:46pm
en: @BookwormMari Hi Mari, Did you have a nice getaway? Get all your reading done, or are you like me? I take books, then don't read. 07/12/09 06:46pm
en: we r to be salt and light to the world.we r ineffective if all we do is talk about how dark the worl is with other lights or how unsavory 07/12/09 06:46pm
en: @roofer_on_fire haha, i agree booze can definitely get you through the third. Its not that its THAT bad, its just that its not 1 or 2 07/12/09 06:46pm
en: Make sure on all your tweets today you put #sammie on the end or the beginning we have 24hrs to make @PrinceSammie a trending topic #sammie 07/12/09 06:46pm
en: Ultimately, losing is more useful than winning wouldn't you say?...unless it's winning the lottery or losing a fight with a polar bear... 07/12/09 06:46pm
en: RT @DMosley: Are u at your ideal weight? If not, how many pounds would u like to lose (or gain in my case)? ///At least 30 07/12/09 06:46pm
en: Ughh..you can always rely on drama to find you someway or another 07/12/09 06:46pm
en: I want to play Cricket, the only Cricket Clubs in the Hartford Area are Indian or Caribbean? What about a UK-AU-SA Expat Club? ::grr:: 07/12/09 06:46pm
en: @denniskneale let's be clear, they do not give market views. They give rumors and priviledged info, which is used by CNBC to pump or trash 07/12/09 06:46pm
en: @marusula The sour cherries look wrinkled up in syrup. Did I screw up the sugar/ water ratio? Cook too hot or long? 07/12/09 06:46pm
en: RT @Quizgod: @Helen_b you have just said 2 of the banned words.....lol..SHhhhhhhhhhhhhh..or i'll b in trouble.... 07/12/09 06:46pm
en: @RealitySteve Hmm... or they are so concerned about secrets leaking that they had #3 stay away too? Curious! Thanks for the reply :) 07/12/09 06:46pm
en: I agree! RT @TrekLightGear Great day to head down to Pearl Street (or your own downtown area) & support local small business! #lovethelocal 07/12/09 06:46pm
en: Finally got a new trackball for my Blackberry. I couldn't scroll up or down for nothing. That's the downside of having a blackberry 07/12/09 06:46pm
en: FOXY BROWN, SLIM GOODDY & SKYS DA LIMT FAM. Live Sat july 18@ toads place 300 york st. N/h ct. Drs open@8pm. Hit me on facebook or myspa ... 07/12/09 06:46pm
en: @MusikLync some nike flip flops or something...bum ass. 07/12/09 06:46pm
en: "Racquet and Jog" of Broadway in Tyler, TX - if you run, bike, board or play ball they have everything. Awesome place- 07/12/09 06:46pm
en: yes or no? Ever? 07/12/09 06:46pm
en: Where is @RAEKWONICEWATER?! I wanna kno if him and Ghost accepted Islam or is Napoleon was talkin ish 07/12/09 06:46pm
en: found some awsome vlogs on utube. never thought id like the whol blog or vlog thing but theyre awsome, the ones ive found 07/12/09 06:46pm
en: all bummed out cuz i didnt get to watch BRUNO,frck. i hope to watch it within the first week or else it would be OLD!! -now im watchn bball; 07/12/09 06:46pm
en: Can't tell if i'm hungry or nauseas. Hate that. 07/12/09 06:46pm
en: @BabyGurlBee VERY CLOSE BUT SHE DIDNT HAVE A COWBOY HAT ON IN SOLDIER OR BOOTYLICIOUS 07/12/09 06:46pm
en: @Boko22 ps. That may or may not be true. I too was drunk a bit. 07/12/09 06:46pm
en: RT @sohood: be you 100% all the time, FUCK what the industry states is sexy or good. 07/12/09 06:46pm
en: @TonyKYEO definitely. I have to go to work soon but I'll get them uploaded tonight or tomorrow morning. 07/12/09 06:46pm
en: angel or devil? What the hell ??? 07/12/09 06:46pm
en: @DatDude75 Or bull riding whatever 07/12/09 06:46pm
en: @ryuuenx I think it is rude not to take it. I mean, it's not a big deal just to take it. Maybe you'll need it someday or just toss it later. 07/12/09 06:46pm
en: @picalili yeah sounds good might do that - about 10ish or later? 07/12/09 06:46pm
en: @zakgeorge and my mom thinks i'm weird for what i flim or take pics of. lol http://twitvid.com/84776 07/12/09 06:46pm
en: Ladimb58@gilbirmingham:what do you use 4 tweeting? What kind of or fone or pc? 07/12/09 06:46pm
en: "This could be sumthing or maybe its juss nothinq at all " - Drake 07/12/09 06:46pm
en: what do you prefer, blogger or wordpress? 07/12/09 06:46pm
en: @ThruTheMonsun ughhhhhhhhhhhhhhhhhhh ill run or something lmao 07/12/09 06:46pm
en: @okbeatnik also do you like the hacker or commute better 07/12/09 06:46pm
en: Quiz time! The people upstairs are A having sex B exercising or C neither it's the dog locked up in its kennel. Sigh. 07/12/09 06:46pm
en: Re: Should I buy now, or have I missed t... ( CDN.L): Roobster do you think sd will let this go for under 90p i dont?? By senn1965 07/12/09 06:46pm
en: RT @Cortnee4Christ † 4 any1 who doesn't know, I ♥ to RT, pray, & spread the ♥ of God. If in need, feel free 2 send me a tweet or 07/12/09 06:46pm
en: @JackJack5225 So many things now a days we've become so dependent on them. I can't live without my phone or ipod. 07/12/09 06:46pm
en: Perusing an escort agency website- Tagline "Cheap and Young" emphasis repeatedly on cheap. But wait... They are same or more than I am! Sigh 07/12/09 06:46pm
en: I'm not a huge fan of beyonce but damn that new song is good..don't wake me from this sweet dream or beautiful nightmare..I love the video 07/12/09 06:46pm
en: Will all u females who are text raping me, please not cross the line or u will be dealt with. U will be erased 07/12/09 06:46pm
en: @thaliajael @tdubb757 when I get like this or that being alone its something I perfer... yeah its temporary but if it help me right now ... 07/12/09 06:46pm
en: eet after the game, or are you ducking out immediately afterwards? 07/12/09 06:46pm
en: @BlueAndOrange Whatever's across the Hudson from 130th St. Your neck or no? 07/12/09 06:46pm
en: @spontaneo I wasn't sure if I should offer him a ladder (to get out of the hole he'd dug himself) or a shovel (to dig in deeper). 07/12/09 06:46pm
en: @maygunrose lets hope we dont get reported or whatnott :L 07/12/09 06:46pm
en: I truly enjoy any thing that makes a car ride more enjoyable... or any certain thing that makes a car ride an event. #cblurb 07/12/09 06:46pm
en: Chuck Norris is a trending topic. He is omni-potent. Not even Bruno, Michael Jackson,Harry Potter or Pirates combined can stop him. 07/12/09 06:46pm
en: Niggaz talkin bout shampoo tonite should i go or stay da fuck home? 07/12/09 06:46pm
en: @toesinthesand22 what you should do is create focal points in & outside our home to draw the eye away from problem ares or to hide 07/12/09 06:46pm
en: @arabyrd ninety nine ... Like the pub in town? Or the year '99? 07/12/09 06:46pm
en: OMFG i am so watching G-Force. & that shit is in 3-D too, oh hell fucking yeah. guinea pigs, hamsters, or whatever the fuck they are FTW ! 07/12/09 06:46pm
en: is at home. Went to church and then to Heather's...now I am tired...debating on a nap or the pool...hmmm! 07/12/09 06:46pm
en: @JColeNC either you gon wine or you clime. I chose the ladder 07/12/09 06:46pm
en: @scottifer420 i dont feel like laughing right now. Im not gonna feel better until i get a hug or until he stops being a db. 07/12/09 06:46pm
en: @uberscholar yeah was that ugly or what? 07/12/09 06:46pm
en: The upside to being sick on a beautiful weekend? Getting tons of work done. Is that really an upside, or a warped sense of reality? 07/12/09 06:46pm
en: Thinking I may be the only BlogHer attendee that won't be sponsored. Or that doesn't want to be. 07/12/09 06:46pm
en: or is that my mouth? o.0 yeah. the " . " is def my mouth. 07/12/09 06:46pm
en: @bgotnice yeah basically or ramen haha. So many flavors to choose from. 07/12/09 06:46pm
en: Have bike seats got smaller, or my my ass just got larger ? 07/12/09 06:46pm
nl: ...never look, talk or act like a Denzel is just stupid. XOXO 07/12/09 06:46pm
en: just saw a man either: on drugs, in a deep sleep, or dead. im gunna go with dead. 07/03/09 02:36pm
en: I joined twitter for no reason other than to follow NHL free agency. Now I feel obligated to update it or something. 07/03/09 02:36pm
en: Google’s New Layout: Love it or Hate It? http://ff.im/-4LaKC 07/03/09 02:36pm
en: @amynugget_ I'm getting ready to leave for LACC, just text me or something when you and Rocky get there. 07/03/09 02:36pm
en: @MrFaShIoN09 male or female. Aint no future in frontin EVER! Keep it real or keep it the fuck movin. 07/03/09 02:36pm
en: home...for better or worse. 07/03/09 02:36pm
en: heey its around 11:30 at night here in Perth :) *sigh* wish i was in london, or newport.... 07/03/09 02:36pm
en: @mcdanal if they have any victory in FL, u should check it out. Prima pils or summer weiss r good. My fave wheat is Paulaner hefe 07/03/09 02:36pm
en: @THE_REAL_SHAQ The Big SHAQ-A-LIER or The SHAQgician, cause when you come to town magic happens!!!! 07/03/09 02:36pm
en: @bealers http://twitpic.com/95hlh - Either my vision is wonky, or... 07/03/09 02:36pm
en: Going to see my gram. Be back later. Single. Call or text 446.3602 07/03/09 02:36pm
en: Been in foul/reclusive mood all week. Not sure whether to try to shake it, or embrace it (and probably accomplish more)... 07/03/09 02:36pm
en: First time I won anything in a raffle or lucky draw - and it's also my 2nd time winning!! Haha. See the prizes http://twitpic.com/95htr 07/03/09 02:36pm
en: Anybody going to have some great BBQ today or some great food? #North Korea #follow friday #moonfruit 07/03/09 02:36pm
en: @ljones1981 it's slightly overrated! Most of them don't answer or respond to me anyways--some of them never tweet-and the rest are autobots 07/03/09 02:36pm
en: Denver to the Allegro Cozumel; 7 nights "All Inclusive"; Leave on Tues or Wed between 7/28 & 8/12. $694.55. Very Limited. Kids 12 stay f 07/03/09 02:36pm
en: All I want in the world right now is a seven layer cookie. Or 12. 07/03/09 02:36pm
en: Photo: Believe in or not, i wanna watch. HAHA http://tumblr.com/xro289o62 07/03/09 02:36pm
en: MyAds: Promote Your Blog, Product or Service on MySpace http://tinyurl.com/kuc78h 07/03/09 02:36pm
en: @OshiHidra shit was not gil?@animeangelblue u guys wanna come over next Thursday or Saturday for said skit needs? 07/03/09 02:36pm
en: I just took the "Team Selena & Demi or Team Miley & Mandy- Which Are You On?" quiz and got: Your On Team Miley & Mandy!! Try it: 07/03/09 02:36pm
en: But if you're thinking 'bout my baby it don't matter if you're black or white http://tinyurl.com/mjbmqq 07/03/09 02:36pm
en: Why do BlackBerry activations take so long? Or is it just 'cause it's Friday afternoon and I should have left work hours ago? 07/03/09 02:36pm
en: wonders if someone is constantly sabotaging the Cornelia Marie or if it is really just a piece of shit. 07/03/09 02:36pm
en: Anyone want to go gamble with me? Or should I take my roomate? 07/03/09 02:36pm
en: @lilhawaiianpnai i talk to her last night.. she said they were leaving..but haven't gotten n e word. but were leaving today at 4 or 5 07/03/09 02:36pm
en: @kevinskaiser i saw an ad at creation festival that the green trailer was going to be shown, did i just miss it or wasnt it there? 07/03/09 02:36pm
en: @bowwow614 those burgers better be come'n from @bootsys or I may have to Funk you up 07/03/09 02:36pm
en: If I ever discover an illness or disease, I'm going to name it Bada Bing. 07/03/09 02:36pm
en: @pbzeto do u see what this nigga is saying!lol like we dont exist in the D or something. This shit is funny as fuck! 07/03/09 02:36pm
en: I totally miss my long hair...but I cut it for cancer patients...aren't I amazing or what? *extentions next week* 07/03/09 02:36pm
en: @PoloPony95 oh yes, went there a lot when i was little, i popped over in the last year or so to check it out too when we had lunch next door 07/03/09 02:36pm
en: I just started a new chapter of my life be deleting like 300+ people on Facebook that I no longer talk to from High school, soccer, or w/e!! 07/03/09 02:36pm
en: ESL endorsement (or maybe a reading teacher endorsement?)... how do I go about selecting a program?? 07/03/09 02:36pm
en: New series CALIBRATE starts this Sunday, July 5th. Join us at 9:00 or 10:30. 07/03/09 02:36pm
en: I loved the play I just watched: The 25th Annual Putnam County Spelling Bee! <3 watch it if you love musicals or even plays in general :) 07/03/09 02:36pm
en: @Mommy2Jayden03 hey check this jennifer just called me and asked me to borrow her 40 bucks til friday cause she has no cigs or beer fuck no 07/03/09 02:36pm
en: @wilhelminawang And blogs. I hardly write e-mails anymore - long or short. Being a writer, it's a trip. 07/03/09 02:36pm
en: I'm feeling incredibly hot! it's 30 Degrees, 86 Fahrenheit. I can use an icecold milkshake or so. 07/03/09 02:36pm
en: So... Independence Day tomorrow. Or as we call it in the UK, Thanksgiving. I forget where I plagiarised that from. 07/03/09 02:36pm
en: @ruledbymercury Text me when you're there - we'll be there around 6:30 or so and are planning either Elephant Bar, Ale House or BB after! 07/03/09 02:36pm
en: @Stokesy1966 I would be the one to drive the 50 miles and do it, haha :) I've only done one terracache, but hoping for one or two more soon. 07/03/09 02:36pm
en: Going to work at a fair in clatsknine or some shit for three days get money get paid do work son dolla dolla bill yall 07/03/09 02:36pm
en: just have to read 20 or so more pages and then out to eat with stacie :) 07/03/09 02:36pm
en: @KaveyF No fancy dress (or fetish) parties so *no* idea why. He couldn't understand why I wasn't over the moon, I conclude he's just weird. 07/03/09 02:36pm
en: I'm not a fan of artest or his shot selection but I guess I'll have to learn...and retire the ariza tee...odom better get re-signed 07/03/09 02:36pm
en: so what is more selfish -- making excuses for bad work due to grief or going out of your way to downplay how much a dead person meant to you 07/03/09 02:36pm
en: @PixelF95 Oh, moving schools or do your classes change every year? Personally I'd be over the moon about being in a different class... 07/03/09 02:36pm
en: About to faint from hunger but it's much too early for lunch. Last time I eat breakfast before work. Or get up at 6am to eat said breakfast. 07/03/09 02:36pm
en: @aniedj yup =) Why am I familiar to you? Hehe. I guess I have ever "known" you or ur ID in DAI, Haven't I? 07/03/09 02:36pm
en: @BernieDawg up way too late or too early, but I promised the kids I would make breakfast this morning, a promise made UI 07/03/09 02:36pm
en: @BenjaminWilcox I would wait until Monday or Tuesday. It's a vacation day for (most) folks today. 07/03/09 02:36pm
en: @LilBaybeeFish it could b for many reason we couldve had a nice dream or we move around a lot or we're horny lol 07/03/09 02:36pm
it: 豆瓣电台邀请 4 枚，要的人赶紧举手报豆瓣 ID 07/03/09 02:36pm
en: 7-3:Meditation:Race or creed,everyone has been created by the same hand that created the stars.Thus, to hurt another is to hurt one's self. 07/03/09 02:36pm
en: is goin to either run or ruin this country either way @iamct @acebillionaire coming with me. shout out to @jelly_f_baby. Brown hall 07/03/09 02:36pm
en: man its hot on this island. getting ready for another big night in the pacha funky room..c u there or what?! 07/03/09 02:36pm
en: Not getting a massage or listening to anything "cool" right now. 07/03/09 02:36pm
nl: HUNTER.. OR BUST 07/03/09 02:36pm
en: @carmadee : what txt msgs? u might have the wrong # or sumfin! 07/03/09 02:36pm
en: obama is supporting the honduran thug in thanks for giving him ideas for his future. prepare to bow down to dictator obama or die 07/03/09 02:36pm
en: @Jacquies call them or go get the bill from the closest zain or just login to your account in kw.zain.com 07/03/09 02:36pm
en: Big decision: do i want a dd iced coffee, or starbucks light frapuccino? 07/03/09 02:36pm
en: @Sunfire2109 Wait... did someone say that about Linnaeus or did he say so himself? 07/03/09 02:36pm
en: @MSSUNSHYNE1 Ima get it like 5 or 6. Right B4 I head to the radio station. 07/03/09 02:36pm
en: #follow friday love to my local (or should I say LOCO) brothers! @DJSugaShane @dj_scottie @darren_cox @SonicFoundation @djclintstorm 07/03/09 02:36pm
en: Man with no arms or legs can play football, swim and surf http://tr.im/qLZs 07/03/09 02:36pm
en: Trying to decide if i really want to spend the money on a new phone or not 07/03/09 02:36pm
en: it depends on whether the crown is the one adjusting or it is recessed or button pusher. 07/03/09 02:36pm
en: @xavginoux how warm? I want to visit in the next year or two 07/03/09 02:36pm
en: Click here http://tinyurl.com/n24jx2 to find sexy people from your town to date, or find singles waiting to chat with you! 07/03/09 02:36pm
en: @six_two Lol I know I'm so embarrassed lol. I need to get that track from iTunes or something lol. How are you? 07/03/09 02:36pm
nl: @Sofie68 boleh keluar.. pakai astronaut soon.. or macam bubbleboy hehe 07/03/09 02:36pm
en: @jonathantullos iis he in ur house or u just wanna get rid of him for being a nuisance http://myloc.me/7ixh 07/03/09 02:36pm
en: Click here http://tinyurl.com/n24jx2 to find sexy people from your town to date, or find singles waiting to chat with you! 07/03/09 02:36pm
en: YAY or NAY: "One Night" - @FinisKing :: Like it? Loathe it? Sound off on it -> http://thaaside.blogspot.com 07/03/09 02:36pm
en: you have to wind it for 10 - 12 rounds by turning the crown clockwise. To re-adjust the Day or Date back correctly, 07/03/09 02:36pm
en: Question: is the posh supermarket pronounced way-trose or wait-rose. I need to know so I sound believable when lying about shopping there 07/03/09 02:36pm
en: @itsjussTJP hey if you want that candy bar, you need to text me or something later. 7252902593 :) 07/03/09 02:36pm
en: RT @TheHomeopath: Don't have the time or transport to see a homeopath? Why not do it by email or phone? http://www.NaturallyHomeopathic.com 07/03/09 02:36pm
en: @luvfool14 Dark shadows is supposed to come out in a year or two...it's a vampire movie, but i have no knowledge to if hes the vamp. lol. 07/03/09 02:36pm
en: @EWAusielloFiles: Kate Hewlett RT @ShawnRyanTV Ep 1 of Lie To Me need 30ish woman 2 play multi personality who witnesses murder or is killr 07/03/09 02:36pm
en: @DanceChrisBrown YES Ne-Yo or jamie couldn't have done it the way you would have 07/03/09 02:36pm
nl: RIZUKI!! tp pendukungnya BAYU GENDENG mantabh cuyy!! RT: @reevosaulus: Rizuki or Bayu Gendeng ? 07/03/09 02:36pm
en: @santasdevil I hope so too.....im really sorry that it happened. i hope it all goes well, or as well as it can 07/03/09 02:36pm