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DDD: putting the model to work

Posted by Eric Evans on Nov 06, 2007 10:00 AM

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Architecture

Topics

Object Oriented Design,

Language,

Design,

Modeling

Tags

JAOO Conference,

Domain Driven Design

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   where is 2nd part

   Nov 7, 2007 10:10 AM by Yale Li

   I do not see any control for pause/forward/play recorded presentation. It completed Eric's first part, but it is not playing the 2nd part of the talk. Do i need to wait for 30 minutes for the break between 2st part and 2nd part?

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   Re: where is 2nd part

   Nov 7, 2007 10:10 AM by Yale Li

   well, i found the controls by mouse over the video,

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   Re: where is 2nd part

   Nov 7, 2007 10:12 AM by Yale Li

   so i found the end of the talk, i guess that the 2nd part of talk is not posted yet. am I right?

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   A great talk

   Nov 7, 2007 10:13 AM by Yale Li

   this is a great talk i recommend for everyone. Very well put and clearly explained concepts

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   Re: A great talk

   Nov 7, 2007 1:10 PM by Rolf Lampa

   Yes, it seems to be based on true experience. I once used other names in this domain, like Trip, TripEvent(Stops), TripSections(Legs) etc, a bit abstract perhaps, but generic. Downside with "generic names" is that it doesn't tend to sound very much like the "domain language", which is important for communicating core concepts with the domain experts, upside with generic names is (for the designer) that the emerging model "invites" to discovering generic patterns and "meta solutions" (a kind of a "the trees don't obscure the forest effect" if undressing the names of domain specific implementations). This in turn increases "insights" in the problem domain. And yes, try to get as deep into the problem domain as possible by discussing many and all aspects with domain experts. Don't stop at the first bright idea. I like that. But, OTOH, do NOT assume that the domain experts _fully_ understand the principles involved!, instead DO assume that they know (the best) how to do the job the way they currently do it (which is not exactly the same...). What I am saying is that a thorough analysis in the pre-design stage is an unique occasion also for the domain experts (usually the end customer) to learn to even better understand the problem domain(s) at hand, and from that follows a unique opportunity to potentially *improve* the business concept(s). Well, that's my experience anyway. It would be really interesting to hear also the other half of the lecture, hopefully the second part will also be uploaded?

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   Re: where is 2nd part

   Nov 7, 2007 1:30 PM by Diana Plesa

   Hi Yale Yes you're right. the second part of the talk will be published soon:)

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   Player stops

   Nov 9, 2007 1:09 AM by Ivo Limmen

   Hi, Can the video also be downloaded somewhere? My connection fails sometimes and the player wants to restart and I am not able to seek to the point where the player stopped the last time.

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   Re: Player stops

   Nov 9, 2007 7:45 PM by Floyd Marinescu

   Unfortunately not, however we are working on a fix but it may not be around for another couple of months.

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   Download Video

   Nov 13, 2007 9:36 AM by Hadikusuma Wahab

   Hi Ivo , you should try OrbitDownloader. Its free and can download any types of video :)

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    Eager to see part two

    Nov 13, 2007 11:27 PM by Corin Lawson

    A very good talk. Despite Evans' moments of awkwardness he gave a coherent and well expressed presentation with a thought-out example. As a practitioner the new and exciting bit was at the end: many models can work to our advantage. Often I will consider 'the context' of a system first, define the basics of 'it' and move on. Maybe, next time I will spare some thought for the many contexts and workout a framework for each of them. I can't wait to see how to make it work, in part two... how/where will it be advertised? Will there be a link from this presentation?

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    Re: Eager to see part two

    Nov 16, 2007 8:00 AM by Rolf Lampa

    >> Despite Evans' moments of awkwardness Wow this really was an idiotic claim! What if Mr. Evans was only thinking very deep inbetween, trying to increase value by trying to avoid confusing you by introducing too much complexity too early? He's actually doing very good. He's allowing things to sink in. Would you know exactly why his very humble and pleasant performance sometimes makes a short brake for a moment of deeper reflexion? This is what designer's do. They stop and think where other ruch ahead and causes,um... "all sorts". Disregard this stupid comment. // Rolf Lampa, Sweden.

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    Re: Eager to see part two

    Nov 16, 2007 9:48 AM by Rolf Lampa

    >> Disregard this stupid comment.

    Well... this comment doesn't look very clever either... It should of course have read: "Disregard the quoted stupid (and mean) comment, by Corin Lawson"

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    Re: where is 2nd part

    Nov 29, 2007 6:02 PM by Sddd jkljlkjl

    Great how different the interpretation of "soon" can be.

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    Re: Eager to see part two

    Nov 30, 2007 12:23 PM by Diana Plesa

    Part two is now online on InfoQ: http://www.infoq.com/presentations/strategic-design-evans

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    Very good - now we wait for part THREE

    Nov 30, 2007 6:35 PM by Rolf Lampa

    Part two is now online on InfoQ: www.infoq.com/presentations/strategic-design-evans

    Thanks. This second part was very good as well. What's really worth considering in any enterprise system is the approach to separate a system into : - Core Domain(s) - Sub Domains (generic or supporting dittos) Very good talk and recommendations, with example of how to people tend to put too much effort into the wrong (sub) domains and so end up with a crappy designed Core Domain. Eric demonstrates his experience - and matureness - as a designer of "real world business systems" when he points out that business systems actually has to incorporate ALSO messy and chaotic parts (for example for varying types and quality of in-data to the system) since this is an essential part of supporting (solving) the REAL business problems/situations. But - and here comes the point - although "messy parts" are unavoidable, make sure to keep those messy parts (domains) out of the "clean" and well designed Core Domain(s)! No surprise, very good talk again! I look forward to seeing also the third (last?) part. :) // Rolf Lampa PS: Btw, was this video recorded in Sweden? (I think I saw the text "musikhuset" (music house) on that blue sign).

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    Re: Very good - now we wait for part THREE

    Dec 4, 2007 6:06 PM by Niclas Nilsson

    PS: Btw, was this video recorded in Sweden? (I think I saw the text "musikhuset" (music house) on that blue sign).

    In Denmark actually, at the JAOO conference. Kind regards Niclas

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    Re: Very good - now we wait for part THREE

    Dec 5, 2007 8:29 PM by Kuei-yang Lo

    where can i download the slides...? please... Thank you so much...

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    Re: Eager to see part two

    Apr 2, 2008 12:27 PM by seri katil

    Hepl Blog >>> evden eve nakliyat

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