context at a particular time - i.e. when. The problem is addressed and resolved applying the phases of EI process (i.e. how ) by designated actors at specific date/time. Finally, the decision problem is resolved by interpretation of indicators extracted from relevant information at a specific date/time or over a period. We implement the architecture in a simple prototype system.

## 4.1 Implementation Of The Framework In A Prototype

We are able to build a knowledge repository based on the framework. We implement the system in an intranet environment in form of a knowledge portal. The exploitation of knowledge with temporal properties facilitates the retrieval of knowledge with their respective timestamps and reasoning on duration or time interval between related knowledge. The specification of the prototype system for realizing this goal is highlighted below.

a) Exploration of knowledge is based on the role of an actor.

b)   User's activities are captured in terms of who? what? why? and when? The user is guided to indicate his need using a query method based on analysis and constraints (David & Thiery, 2003) in order to exploit stored knowledge that relates to a new problem.

c) Exploitation of knowledge with their respective timestamps.

d) Analysis of duration between stored knowledge.
The inclusion of temporal properties of knowledge aids qualitative reuse of knowledge in a KM system. For instance, exploitation of knowledge with their respective timestamps can help users or actors to access required information based on deduction from analysis of the timestamps. It could facilitate access to related decision problems in a specified range of period e.g. year. It could aid to determine the proficiency of an actor by granting access to the period such an actor has participated in resolving decision problem. Consequently, an actor can be guided with respect to the plan of application of re-usable knowledge to a new project. Moreover, we take cognizance of different contexts of users' needs which change considerably over time. This issue is taken care of in the KM system by handling exploitation of knowledge based on the roles of actors and contexts of need.

## 5. Conclusion

KM is inevitable for innovation in organization and EI also serves as an instrument for competitive advantage in terms of strategic decision making. Knowledge is an economic resource which needs be acquired from both activities and actors in a given project, for storage and exploitation. There is less emphasis on exploitation of temporal properties of knowledge in many KM systems. Consequently, we proposed to exploit temporal properties in knowledge management systems of EI projects in order to reason on available knowledge to generate useful inferences for a new project.

An important requirement of developing a dynamic KM system is the consideration of user needs. We adopt an approach in which the role of user or actor drives the system's results. EI aims to provide relevant information to right user(s) for solving decision problem. Thus, the major goal of