Triangle of project management!
Can a job be quality, not cheap and be done in time? Everyone is looking for the perfect deal, but you have to abide by the “Triangle of project management”, which is the main of any business. Consider what is more important to you of the three parameters (sides of the triangle) and allow control of the other two sides of your counterparty. It is logical that if you change one side, it will affect the other two. Anyone determined the correct parameter important for him (side) will know what he’s doing and what you will receive. Looked at things realistically – only as a guarantee for success!