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Survey criteria

The NCD Survey measures the health of the core of your church since our research clearly shows that the health of the core most influences the church as a whole and its wider community. In order to provide as objective a measurement as possible, it is important to then measure the core of your church against the similarly defined core of other churches in the NCD database. To do this, a criteria that is relevant for the widest range of biblical church expressions must be used. For this reason, NCD applies the ministry task, worship and small group attending criteria.

Smaller churches

If your church does not have 30 people who fulfil the survey criteria, you will still get an accurate result by surveying all the people who do fulfil the criteria since they are a 100% sample of the core of your church. It is the best possible sample.

Larger churches

If your church has many more than 30 people who fulfil the survey criteria, there is no need to survey more than 30 as the accuracy of your result will not increase as long as those people fulfil the criteria and are representative of the overall church demographics. As with any survey, significantly biasing the NCD Survey sample in any particular way will of course change the results. For example, surveying a disproportionately large number of people in a particular age, gender, or ethnic group or having many more leaders in the sample as opposed to people who have a ministry task but are perhaps not leaders, can bias your results. The survey does measure the core of your church, however the core according to the criteria may be wider than you realise.

Therefore in selecting your 30 people, pay particular attention to making sure you first look at the full spectrum of the kind of people who fulfil the survey criteria in your church, then select survey participants in such a way as to get a representative sample of your whole church. If, having considered such a list, the survey would be easier to facilitate by including more than 30 people, by all means do so, but be sure they all fulfil the criteria and are collectively representative of your whole church.