Engineering and management consulting services have a high share of total consulting services. Occasionally, there are difficulty for the client to define the problem, which needed to be solved by a consulting project, the project has some ambiguity that reflected in its request for proposals document (RFP). Engineering and management consulting projects have different types of RFP depending on the degree of defining project problem and defining scope of work. Poor quality of the written RFP may lead to project scope creep and other problems that affecting the success of the project. It is important for the consulting companies to have a system for evaluating the quality of the written RFP to classify the project according to its degree of uncertainty and establish the system for managing the project. This research proposes a model for RFP evaluation. To develop the model, the measurement scale (MS) was established. The MS is based on factors of measurement. Those factors and their relative importance on the evaluation were determined using Fuzzy-AHP method. Then a scale for measuring each factor was established by using RFP evaluation cards (RFPEC). The model was applied for three projects. The proposed model was a helpful tool in the preliminary stage for categorizing the project and then taking the decision whether to develop a proposal and bid for the project or not.