1) The indicator does not need to focus on households only – it can be rephrased to focus on individuals or companies.
2) Consider verifying the response either by asking more details (for example, Who was the veterinarian? or What services did you use?) or, in the case of products, asking if you can see it.
3) Consider asking people who responded “no” why they did not use the product / service.
4) Consider also assessing how often the respondent used the promoted service/ product, so that you can measure any frequency-related changes. You have two options how to gain the required data:
- If the respondents are likely to remember the frequency (because you are using a short recall period or because it is likely that the person used the product/service a few times only), you can ask: "In the past [specify the time period], how often did you purchase/ use [specify the service / product]?"
- If the respondents are not likely to remember the frequency, ask: "Can you please tell me when you last used [specify the service / product]?". While it is possible that a person used the service / product, for example, yesterday but otherwise s/he uses it only once per year, in the total sample of respondents, such 'accidental' facts cancel each other out and you gain more reliable frequency data than you would get if you had asked "How often ...?".