Scientific approach to evaluation follows pre- specific research design. The criteria of judgement or effectiveness are determined prior to execution of the programme. The tools for measuring the effects against different criteria are developed in advance.
The evaluators are trained about their objective roles, especially in the context of administration of tools, data collection, analysis and interpretation of data. Evaluation is conducted objectively as per pre-specific design.
Mainly, it concentrates on making judgements on different components of a programme through the matching of the programme outcome/operation with anticipated outcome/ expected norms of operation.
Humanistic approach to evaluation aims at illuminating decision makers about the process of implementation of a project. The issues and concerns of persons having stake over the project are highlighted and discussed in detail. The operational parts of a programme, the constraints involved in execution, positive and negative effects of operation of a programme are described qualitatively.
The evaluation does not follow pre-specific design. The evaluator adopts qualitative methods like participant observation, interviews, continuous interactions and experience notes to describe programme implementation. He leaves the judgement part of evaluation to the decision makers.