This last year I took over more software projects from other development firms and consultants than ever before. Almost universally the business stakeholder tells me something like this: "Such and such firm agreed to build XYZ for $XX,XXX. Things started well and we have completed and paid for 80% of it and now they are stuck."
Read more on my LinkedIn: https://www.linkedin.com/pulse/your-software-project-stuck-80-phillip-zedalis/