Because they weren't managed correct - and/or because they were not planned right.
Most projects evolve over time; they become more complex than originally thought. This is a natural circumstance that can’t always be avoided. Only experience in the project management team can make sure that this fact doesn’t derail the entire project.
Making suppliers liable for delays and any other short comings in the process is paramount for success. Just like the RFP or system requirement specification must be clear and to the point without any room for misinterpretation. Service Level Agreements (SLA) is always the provider’s preferred loophole – and chances are that you won’t even know about it before the question of liability arrives.
By then it will always be too late to do anything about it and you are the one stuck with the crippling extras…
Voiceline can manage your Telco or IPT project as project manager - or aide you as a consultant.
