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Saber Shebly explained it very well. Fully agreed with Him.
Stakeholder expectations.
Cost, Time & Requirements may form the triangle from which the results are driven but you can get the requirements wrong, go over budget & take too long but if the stakeholder is with you on the journey then it could still be a success.
Conversley you could be spot on with your requirements, under budget and on time but if the stakeholder isnt happy - then you have failed.
The primary challenge of project management is to achieve all of the project goals and objectives while honoring the preconceived constraints.
The primary constraints are scope, time, quality and budget. The secondary — and more ambitious — challenge is to optimize the allocation of necessary inputs and integrate them to meet pre-defined objectives.
Customer acceptance
all of these issues are important
The major take-away from the Triple Constraint, being that it is a triangle, is that one cannot adjust or alter one side of it without in effect, altering the other sides. So for example, if there is a request for a scope change mid-way through the execution of the project, the other two attribues (cost and time) will be affected in some manner. How much or how little is dictated by the nature and complexity of the scope change. As an added example, if the schedule appears to be tight and the project manager determines that the scoped requirements cannot be accomplished within the allotted time, both cost AND time are affected
Successful project = generates benefits requested by the customer and by the controlled (3 kpi's) quality of the requested product (the constraint triangle being only a means of control).
