[rules-dev] backward chaining

[Christine Karman]

On 11/01/2010 10:39 AM, Wolfgang Laun wrote:
> Mostly out of curiosity:
> I have implemented a few things using full-blown backward chaining and
> I know that these things could have been implemented just as well using
> forward chaining. Therefore: Why does your project "need" bw chaining?

A forward chaining engine finds all premisses and then draws all 
conclusions it can make, recursively. A backward chaining engine finds 
all goals, then tries to satisfy them using available facts. If no facts 
remain and no goal has been satisfied, the system should ask a user. A 
forward chaining engine would never find unsatisfied goals, so it would 
never try to acquire additional information, unless you specifically 
program it to do so. Basically, by doing that you build in a backward 
chaining component.

I have built quite a few expert systems that used both backward chaining 
and forward chaining. Either one wouldn't have done the job.

dagdag
Christine

> Of course, if you have a good algorithm based on that, it may be easier
> to stay with it.
> -W
>
> On 1 November 2010 10:15, Christine Karman <mylists at christine.nl 
> <mailto:mylists at christine.nl>> wrote:
>
>     On 10/29/2010 04:32 PM, Mark Proctor wrote:
>     > We have a prototype of BC that works, but won't be ready until
>     Q1 next
>     > year.
>     Is that in the svn? Is it a separate project in svn, or is it part of
>     the trunk?
>
>     dagdag
>     Christine
>     > Mark
>     >> dagdag
>     >> Christine
>     >
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