The Congregational Assessment is great way to look at your church through fresh eyes—examining those "small things" that we may take for granted because we are so used to them. This is a qualitative tool using your own perceptions, (as an individual and as a group in filling out the form) as to how you are doing in each area of assessment.
There are also quantitative tools that will help you understand what is happening at your church. Knowing this and how it compares to other churches can provide guidance on what kinds of activities, from the many choices available, could have the most positive impact. This is sometimes described as "doing the right things, rather than doing things right." As in the car example above, you may want to do a number of tests on your automobile before you decide it needs oil. Congregations that work only on one aspect of the visitor and member experience, such as welcoming visitors, making that aspect better and better, may be missing some larger issues. Quantitative tools allow you to determine which parts of that experience, and its process, need the most work, so you can work on them first.
Quantitative tools can also help you plan and assess your growth targets. For example, a large church usually requires more visitors for the same net membership gain as a smaller church—because the large church will typically need to replace more members each year who move, die, or otherwise leave the church. See the Guest Calculator (Excel) (PDF) which will give you an estimate of how many first time visitors you need to average in a week to meet your future growth targets.
Please see the Membership Journey Diagnostic Tools to learn more.