inception stage

The information gathered from the discussions will be prepared in readiness for a feasibility study - the subject of the next stage - and include: 

• a general outline of the client's requirements

• a plan of future action

• the setting up of an organisation for briefing the client

• a consideration of the requirements

• the appointment of a consultant - usually a civil engineer or an architect.

feasibility stage 

This is to determine whether or not it is feasible functionally, technically, financially, legally, and fi­nally to make decisions on future procedures: 

• functional - are the client's wishes in sympathy with what is required?

• technical - will there be any problems with the site conditions: boundaries, right of way or light, easements, services, etc?

• financial - is there a budget and is the money guaranteed?

• legal - will the proposal meet planning approval, preservation orders, availability of services, etc?

http://www.doc88.com/p-11573243311738.html?s=rel&id   (feasibility study of green roof)

https://www.doc88.com/p-842811443414.html