One of the reasons for project failure is 'Lack of Planning' and this not only includes planning for what one is going to do in the project but it also involves planning on how to check that the project is on track. Doing effective tollgates is an excellent mechanism to check the progress and ensure that project is still on the right path.
For the tollgates to be effective, one basically has to seek answers to 5W and 1H (What, Why, Where, When, Who and How)
Let us look at each element in slightly more detail
1. WHAT - Determine the requirements. What is the purpose of the tollgate? What is the information / artifacts that are required? What questions have to be asked?
2. WHY - Determine the objectives of the tollgate. Why are we doing tollgate? Why is it important to do the tollgate? Is the purpose only to review or also to approve?
3. WHERE - Determine the logistics of the tollgate. Where are we doing the tollgate?
4. WHEN - Determine the frequency, duration of the tollgates. When should the tollgates be set up during the project lifecycle?
5. WHO - Determine the participants in the tollgate. Who should be presenting the progress? Who should be audience during the tollgate? Who should be asking the questions? Who is going to take down the action items and meeting minutes?
6. HOW - Determine the decision criteria for acceptance / rejection of the tollgate. How are we going to judge the success of the tollgate? How many tollgates are required in the project lifecycle?
If the team has thought through the above indicative questions, the chances of having an effective tollgate increases manifold. An effective tollgate will have following benefits
1. Keep the project team honest and true to the project objective
2. Ensure that scope, cost and schedule creep DO not happen
3. Effective communication across various levels in the organization (as the sponsor and/or other stakeholders may not be too close to the project)
4. Any issues / challenges are brought to notice at the right time and to the right people so that solutions could be identified