Embodiments of the present invention provide a method and system for scenario based conceptualization and visualization of web based user interface for effort estimation. The method includes providing user selectable scenarios on said web based user interface. A plurality of web components is provided on pre-populated screen to display existing number of screens, further user can modify the screen by adding new functionality based on business requirement. After modification, a workflow is stored in a repository for proposing it as pre-populated screen to new users. An effort is estimated by an effort estimation processor based on said modified user selectable scenarios and compliance standard, and report is generated for each stage of development cycle. REF FIG: 1
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