Hi guys
I want to implement an adaptable scenario in a serious game. I have found my algorithm but I don't know how I should implement it.
I'm already behind my schedule and I want to do this in 4 or 5 month, how can I do it and where should I start?
Should I create a game from scratch? Or can I use a pre-created serious game?

Not even remotely enough information about you, your algorithm, or the project for anyone to advise you on this.

As Dave Mark said. Our answers would be wildly different depending upon whether your "serious game" involves truck driving, nuclear reactor safety, oil spill recovery, etc. In broad terms, the closer the actual activities involved in the serious game are to traditional game activities (e.g. moving a character with mouse/keys, picking up/putting down objects, etc), the more likely that you'd be able to find an existing product or framework with a good fit. If the algorithm is the main problem, why not ask about the algorithm first? If someone can help you solve it a custom solution may be the best way to go.

The game can be a simple 2D game. I work with XNA to create the game. My game's scenario should adapt itself to the history of player's actions within the game and current game world state.I want to use Drools Rule Engine in order to capture player's actions and use them for adaptation, but I don't know how should I do that. How could I use this rule engine in Microsoft XNA?

Okay, I have no experience with Drools, but I can look things up. Are you wondering how to integrate Drools with .NET, or how to use Drools itself?

You can get Drools for .net from:
http://droolsdotnet.codehaus.org/

You can see code examples of accessing Drools from .net at he below in section 3:
http://droolsdotnet.codehaus.org/Drools.Net+-+3.0+User+and+Installation+Guide

I have some documents for working with Drools. But I didn't know how to integrate it with .NET.
I thinks that's what I need!
thanks so much