1) If you want to measure the extent to which the respondents have increased their sales, you can ask them the following question. The respondents might not be able to tell you the exact percentage and therefore you should agree (and practice) with the data collectors on how to determine it (for example, by asking for the average sales before and after the change, keeping seasonal changes in mind).
Q2: Would you be able to tell me how much your sales have increased thanks to these marketing practices?
A2:
1) less than 20%
2) 20 - 39%
3) 40 - 59%
4) 60 - 79%
5) 80 - 99%
5) 100 - 149%
6) 150 - 199%
7) more than 200%
8) is not able or willing to say
2) It is recommended that you also measure which of the marketing practices that were used by the sellers / service providers perceived as most effective and why (it is recommended to include those that were and were not promoted by the intervention; later, you can disaggregate the results based on the practices that were and were not promoted). You can assess their effectiveness by asking:
Q3: In your experience, what was the marketing practice that helped you the most to increase your sales? Please select only one most effective practice.
A3: include a list of marketing practices (both those that were and were not promoted)
Q4: In your opinion, why was this practice the most effective one?
A4: specify: ________________
3) Consider including an additional question asking the respondents who said that the marketing practices did not help them increase sales for their opinion of why the practices were not helpful.
4) While this indicator can show whether the promoted marketing practices were perceived to increase the sales, it does not tell you whether their financial benefits were higher than the invested costs. To assess this important information, consider using the Return on Investment indicator.