A joint venture is best technique to carry out program (or large project), why?

Yes Mumammad its best technique if its not handled by  a big coroporate because normally big corporates have funding, man power and facilities to carry out large projects. For achieving success in ambitious or large projects if two companies or corporates join hands and do a joint venture many things can be equally divided to form a force to achieve success which alone companies sometimes doesnt acheive and it can reduce pressure as well.

A joint venture bring synergy to large project by way of creating a pool of talent/skills/expertise  within Joint Venture partner to smoothly and successfully carry out a large project or any viable project.

Yes, I agree. A joint venture is usually the best way to tackle a large project. Consulting organizations are probably the best bet when it comes to large scale implementations.