The third phase of a digital humanities project, the planning phase, serves to provide your project with appropriate boundaries. Both scope and budget are prone to expanding beyond their original parameters, with scope creep often driving budget problems. By defining the project’s scope in advance, clearly indicating not just what within scope but also what is out of scope, you can prevent your project from consuming more time and money than it was allotted.
It may be helpful to think about scope, cost, and time as a triangle, wherein you can’t change one factor without affecting the other two. Allowing the scope to expand will probably also cause the budget and the timeframe to expand as you require additional resources and labor hours to support extra deliverables. If the budget shrinks, you might have to decide which deliverables to prioritize and which to eliminate.