How do you determine the need to include a specific function in a project?

The necessity of including a feature in a project is determined based on several factors:

• User needs: the feature should solve real problems or improve the user experience.
• Business goals: the feature should support the project's strategy and objectives.
• Resources and timelines: assessment of costs for development and implementation of the feature.
• Priorities: how important the feature is compared to other tasks.
• Market and competitor analysis: whether such a feature exists among competitors and how in demand it is.

Methodologies like MVP (minimum viable product) are often used to initially implement basic features and then add new ones as needed.

Example: if users frequently request the ability to filter products by price, this could be an argument for including such a feature in the next release.