Last Updated: November 3, 2026
Quick Summary
Sample feasibility is the test of whether you can recruit enough of the right respondents within your available time and budget. It checks the target group size, screening criteria, and recruitment cost and timing before fieldwork starts.
- Run a feasibility check before fieldwork, since sample problems are cheaper to fix early.
- Incidence rate is the largest driver of sample cost and timing in most studies.
- Estimate contacts needed by dividing your target by incidence, response, and completion rates.
- Track quota fill rate by subgroup, because totals can look complete while a subgroup stalls.
- Pilot incidence through the intended channel, and document any fallback option you choose.
Table of Contents
- Defining Sample Feasibility in Market Research
- Why Sample Feasibility Matters Before Fieldwork Starts
- Market Research Sample Feasibility Assessment: A Step-by-Step Workflow
- Market Research Incidence Rate: How It Shapes Recruitment Cost and Timing
- Sample Feasibility in Market Research Example: Recruiting Hard-to-Reach Business Buyers
- Market Research Sample Feasibility Timeline: Planning Recruitment Windows
- Reporting Uncertainty and Fallback Options When a Sample Looks Hard to Reach
- Confirm Your Sample Feasibility Before Committing to a Study Budget
- Frequently Asked Questions
What Is Sample Feasibility in Market Research? 2026 Guide
Sample feasibility is the test of whether you can actually find enough of the right people to answer your research questions, at the cost and timeline you have. Accurate Market Research works through that question on projects across the United States, Canada, Latin America, the Caribbean and Western Europe. Here is how we define it, why it matters before fieldwork starts, and how to check it yourself.
Defining Sample Feasibility in Market Research
Sample feasibility is the ability to recruit the targeted number of qualified respondents within the time and budget available. A study can have a perfect questionnaire and still fail if the people it needs are too rare, too busy, or too hard to reach.
Feasibility sits between study design and fieldwork. It asks whether the sample plan you wrote on paper can survive contact with real respondents.
Good feasibility work answers three questions:
- Can we find enough people? This covers the size of the target group.
- Can we find the right people? This covers the screening criteria.
- Can we do it in time and at a workable cost? This covers recruitment speed and budget.
Why Sample Feasibility Matters Before Fieldwork Starts
Most sample problems show up in the field, when they are expensive to fix. Checking feasibility first lets you adjust the plan while changes are still cheap.
A common mistake is writing a sample size without asking whether anyone can fill it. The number looks right in a proposal. Then recruitment stalls, quotas go unfilled, and the timeline slips.
Feasibility work also protects the study’s credibility. If you change the target group mid-project to fill quotas, the results may no longer answer the original question.
Market Research Sample Feasibility Assessment: A Step-by-Step Workflow
Work through these steps in order. Each one narrows the uncertainty before you commit money.
- Write the target population in plain terms.
- Set the screening criteria that define a qualified respondent.
- Estimate how many people in the general population meet those criteria.
- Estimate the incidence rate and completion rate.
- Calculate how many contacts you need to reach the target sample.
- Compare that contact count against the recruitment channels you can use.
- Set a timeline and a fallback plan.
Defining Qualified Respondents and Screening Criteria
Start by writing the screener questions in full. Each extra criterion shrinks the pool.
Ask yourself which criteria are essential and which are nice to have. Dropping a nice-to-have criterion often makes a sample much easier to fill.
Estimating Incidence Rate and Completion Rate
Incidence rate is the share of contacted people who qualify for the study. Completion rate is the share of qualified people who finish the survey or interview.
Low incidence means you must contact far more people. Low completion means you lose qualified respondents after they start. Both numbers feed directly into your recruitment cost.
Market Research Incidence Rate: How It Shapes Recruitment Cost and Timing
Incidence rate is the share of people you contact who meet the screening criteria. It is the single largest driver of sample cost and timing in most studies, because it sets how many contacts you must make to reach a fixed number of completes. A study that needs 200 completes from a group with a 2% incidence rate requires a very different recruitment plan than the same 200 completes from a group with a 40% incidence rate.
The chain of metrics that turns incidence into a budget looks like this:
- Incidence rate (IR): qualified respondents divided by people screened.
- Screen-out rate: 1 minus the incidence rate, the share you pay to screen but cannot use.
- Response rate: people who agree to participate divided by people successfully contacted.
- Completion rate: finished interviews divided by qualified respondents who started.
- Quota fill rate: completed interviews in a subgroup divided by the subgroup target.
- Cost per completed interview (CPI): total recruitment and incentive spend divided by completes delivered.
These metrics multiply. The number of contacts needed to reach a target number of completes is roughly the target divided by (incidence rate × response rate × completion rate). If incidence is 10%, response is 20%, and completion is 80%, then each contact yields about 0.016 completes, so 100 completes require roughly 6,250 contacts. Drop incidence to 2% and the same target needs more than 31,000 contacts. That is why a rare audience can turn a modest sample size into a large recruitment operation.
Quota fill rate matters separately because a study can hit its total completes while missing a subgroup. If a quota for a specific role or region fills at 60%, the overall sample may look complete while the subgroup is underpowered. Track quota fill rate by cell, not just in aggregate.
Cost per completed interview is the metric that ties all of this to the budget. It rises sharply as incidence falls, because screening costs are incurred on every contact while only a fraction convert. A common pattern is for CPI to be several times higher for a narrow B2B audience than for a broad consumer sample, even when the questionnaire and incentive are identical.
Watch out: teams often quote a single incidence figure from a prior study without checking whether the screener, geography, or season changed, a small change in criteria can move incidence by an order of magnitude and invalidate the cost estimate.
Pricing depends on quantity, dates, and delivery. Request a quote from Accurate Market Research for current pricing based on your specific criteria.
The article’s metric chain shows how incidence and related rates drive the number of contacts and cost per complete.
| Metric | Definition | Effect on sample |
|---|---|---|
| Incidence rate (IR) | Qualified respondents divided by people screened | Low IR means more contacts needed |
| Screen-out rate | 1 minus the incidence rate | Share paid to screen but not used |
| Response rate | Agreed participants divided by contacts reached | Multiplies into contacts needed |
| Completion rate | Finished interviews divided by qualified starts | Lost qualified respondents after starting |
| Quota fill rate | Subgroup completes divided by subgroup target | Subgroups can stall while totals look full |
| Cost per complete (CPI) | Total spend divided by completes delivered | Rises as incidence falls |
Sample Feasibility in Market Research Example: Recruiting Hard-to-Reach Business Buyers
Consider a B2B study that needs 150 completed interviews with procurement managers at mid-size manufacturers. The screener requires the right job title, a company in a defined size band, and involvement in purchasing decisions. On paper the sample is 150 completes. In practice the feasibility question is whether 150 qualified procurement managers can be reached at a workable cost and timeline.
A practical feasibility assessment works through the numbers before fieldwork:
- Estimate the population. Count how many mid-size manufacturers exist in the target geography and how many procurement roles each likely has. If the population is small, the achievable sample is capped regardless of budget.
- Test incidence early. Run a small pilot, a few hundred contacts through the intended channel, and measure how many pass the screener. If the pilot shows 4% incidence rather than the 15% assumed, the contact requirement roughly quadruples.
- Apply the metric chain. With 4% incidence, 15% response, and 85% completion, each contact yields about 0.005 completes, so 150 completes need roughly 30,000 contacts. Compare that against the reachable list size and channel capacity.
- Check quota fill by cell. If the design requires a mix of company sizes or regions, estimate fill rate per cell. A cell that fills at 50% will stall the whole study even if total completes look reachable.
- Pick the right channel. Recruitment through trusted professional networks or verified B2B panels often outperforms generic consumer panels for this group, but reach is limited, so confirm capacity before committing.
- Build in extra time. Hard-to-reach samples need longer field periods and a buffer for no-shows and reschedules.
If the pilot shows the target is far rarer than expected, you have three options: widen the least essential criterion, extend the timeline, or raise the budget. Each option changes the study, so document which one you chose and why. Widening a criterion can make the sample feasible but may weaken the answer to the original research question, so treat it as a design decision, not a scheduling fix.
Watch out: a pilot that uses a different channel or incentive than the main field period can overstate incidence and produce a feasibility estimate that does not hold in the field.
Market Research Sample Feasibility Timeline: Planning Recruitment Windows
Recruitment timelines depend on how hard the audience is to reach. A broad consumer sample can fill quickly. A specialist group may need weeks.
Map the timeline backward from your deadline. Allow time for screening, scheduling, fieldwork, and a buffer for no-shows. Many teams underestimate the buffer.
Holidays, seasonal peaks, and regional events also affect response. Check the calendar before you lock in the field dates.
Reporting Uncertainty and Fallback Options When a Sample Looks Hard to Reach
When feasibility is uncertain, say so in your project plan. Stakeholders accept a documented risk far better than a surprise shortfall.
Useful fallback options include:
- Widening one screening criterion that has the least impact on your question
- Extending the field period
- Adding a second recruitment channel
- Reducing the target size with a clear note on the limits of the results
Record which option you chose and why. This protects the integrity of the findings.
Confirm Your Sample Feasibility Before Committing to a Study Budget
Confirm feasibility before you sign off on a budget. A short feasibility check now prevents costly overruns later.
Accurate Market Research supports recruitment, CATI and in-person interviews, focus groups, and multi-market fieldwork, with 24-hour response on quote requests.
Frequently Asked Questions
What is sample feasibility in market research?
Sample feasibility is the ability to recruit the targeted number of qualified respondents for a study within the required timeline and budget. It answers whether the people you need actually exist in reachable numbers, and whether they will complete the survey or interview once contacted. Assessing it before fieldwork starts prevents mid-study shortfalls, unplanned cost increases, and delayed deliverables. Accurate Market Research can help you check feasibility for your specific audience; request a quote for current pricing based on quantity, dates, and delivery.
How do incidence rate and screening criteria affect sample feasibility?
Incidence rate is the share of people contacted who qualify for the study. Stricter screening criteria lower incidence, which means more contacts are needed to fill the sample. A low incidence rate can make a target sample expensive or slow to reach, so feasibility checks should estimate incidence before setting quotas. Adding one or two screening questions can change the required contact volume substantially, so test criteria against realistic population estimates early.
How long does market research sample recruitment take?
Recruitment time depends on audience rarity, incidence rate, method, and fieldwork window. Common audiences recruited online may fill in days, while business decision-makers or specialist patients can take several weeks. Build the timeline backward from your analysis deadline, include time for quality checks and reserve capacity for slow quotas, and confirm the schedule with your recruitment partner before committing to a launch date.
What information should a sample feasibility assessment include?
A useful assessment lists the target population, screening criteria, required sample size and quotas, estimated incidence rate, recruitment methods, expected completion rate, timeline, and risks. It should also state assumptions and fallback options, such as relaxing a quota or extending fieldwork. Documenting these elements gives stakeholders a clear go or no-go basis and makes it easier to explain why a sample target was adjusted.
Request a quote from Accurate Market Research to review your sample feasibility before you commit to a study budget.
