Glossary

New Product Development Research (NPD Research)

Match a method to each stage's decision: interviews for the problem, groups for concept reasons, usability tests for prototypes, home trials for repeat use.

By Jitendra Kumar Nirala, Founder · Updated 24 Oct 2026

Also called NPD research

On this page
  1. 01Definition
  2. 02Quick facts
  3. 03Why each stage needs its own research
  4. 04Where NPD research sits in the Stage-Gate model
  5. 05Which research to run at each stage of new product development
  6. 06What counts as a new product failure
  7. 07Why "I would buy it" does not tell you whether a product will sell
  8. 08How many people to recruit for one stage
  9. 09NPD research vs market research and concept testing
  10. 10How Qualfacto handles it
  11. 11Example
  12. 12Related terms
  13. 13Frequently asked

What is new product development research?

New product development research (NPD research) is the evidence behind each go, change, pause or stop decision as a product moves from idea to launch.

Key takeaways

  • A method that feeds no decision does not belong in the plan.
  • Interviews, groups and home use tests answer why people react as they do and whether they keep using the product. Market size, price and sales need other data.
  • Write the stop rule and the pass mark before fieldwork, and recruit above your target: 71 households to get 60 usable ones at 85% completion.
  • Treat "I would buy it" as weak evidence. Purchase intentions predict sales only imperfectly.

Quick facts

Also known as
NPD research
Gate outcomes
Go, Kill, Hold or Recycle
Interview and group sizes
9 to 17 interviews or 4 to 8 focus groups for similar groups with narrow aims
Leading cause of failure
Lack of understanding of customers and users

Why each stage needs its own research

NielsenIQ (NIQ) reviewed 250,000 consumer packaged goods (CPG) innovations across 130 categories and found that "just 50% of innovation launches show growth by the second year" (NIQ, 19 March 2025). For CPG, half of the launches reviewed were not growing by year two.

A product team in India has to decide at each stage whether to go on, and the stage names alone do not say what to test, how many people to ask or which result means stop.

A concept test, for example, needs a number agreed before fieldwork starts, such as the share of participants who choose the concept over the product they use today, below which the concept is killed. Interviews can settle some questions and others need different data, and mixing the two is where most new product research goes wrong.

Where NPD research sits in the Stage-Gate model

In the Stage-Gate model, each stage ends at a gate, a management decision with four outcomes: Go, Kill, Hold or Recycle (Cooper, Product Development and Management Association (PDMA), 9 September 2026). Research supplies what that decision rests on.

The same source names the leading cause of failure as a "lack of understanding of customers and users", meaning their problems, needs and purchasing criteria.

Which research to run at each stage of new product development

Match the method to the decision at the gate, and write the stop rule before fieldwork starts. The stop rules in the sheet are recommendations, not industry standards.

Interview and group sizes come from a systematic review of saturation tests, which bears on sample size in qualitative work. Hennink & Kaiser (2022, Social Science & Medicine) found data saturation, the point where new interviews stop producing new themes, typically at 9 to 17 interviews or 4 to 8 focus groups for similar groups with narrow aims. That measures when themes stop appearing, not whether a product decision is safe. Diary, survey and in-home-use-test sizes are recommendations. The survey size applies to concept testing, the usability checks at the prototype gate are prototype user testing, and the validation sizes apply to an in-home use test.

Stage
Discovery
Decision
Is the problem worth solving?
Research
In-depth interviews (IDIs, one-to-one sessions), shop-alongs (accompanying a shopper in store), diary studies (participants record tasks over several days)
Planning size
IDIs: 9 to 17 when the group is similar and the aim narrow; diaries: 10 to 20 (recommended)
Stop rule
Recycle if fewer than the share set in the brief (X%) can describe a recent episode and cost it in ₹ or hours
Stage
Concept
Decision
Do they understand it, want it, and why?
Research
Focus group discussions (FGDs, moderated groups) or IDIs for reasons; a survey for scores
Planning size
4 to 8 groups; about 150 per concept for a survey (recommended)
Stop rule
Kill if fewer than X% choose the concept over their current product, with X set in the brief
Stage
Business case
Decision
What are the market, price and margin?
Research
Desk research (reading existing reports and data), market sizing (estimating how many could buy), pricing studies
Planning size
Not an interview question
Stop rule
Kill if the contribution margin at the target price is below the threshold set in the brief
Stage
Prototype
Decision
Can people use it?
Research
Usability tests
Planning size
Per the test plan
Stop rule
Hold if the same task fails for more than one participant
Stage
Validation
Decision
Do households keep using it?
Research
In-home use test (IHUT, a trial of the product at home)
Planning size
30 to 99 per product for a directional read; 100 or more to compare variants (recommended)
Stop rule
Recycle if the share who would reuse the product is below the pass mark (X%) set in the brief
Stage
Launch
Decision
Is it selling and repeating?
Research
Sales and shopper data
Planning size
Sales and shopper data rather than a sample
Stop rule
Recycle if unit sales are not growing at month 12 against the plan in the brief
Decision sheet by stage

What counts as a new product failure

A new product has failed when it misses a measure set in advance, so "failure" needs a measure before any figure means anything. NIQ's measure is growth by year two for CPG innovations. The finding applies to CPG; do not assume it for software, services or durables.

For a CPG launch, use year-two growth as a benchmark. For any product, write your own measure into the research brief: what to track, over what period and against what plan. Missing a sales target, being delisted and never reaching the shelf are different outcomes, and each calls for a different earlier test.

Why "I would buy it" does not tell you whether a product will sell

Stated intent predicts sales only imperfectly. A review of 60 years of research concludes that purchase intentions "are correlated and predict future sales, but do so imperfectly" (Morwitz, 2014).

Interviews and groups are strong on the why: whether people understand the idea, what puts them off, and what they do today. They are weak on how many will buy. In discovery interviews, ask about the last time the person met the problem and what it cost in rupees and hours. That is behaviour, not opinion. See customer discovery interview questions.

How many people to recruit for one stage

Recruit the number who must finish divided by the share who will finish. This is a planning model, with 85% and 65% as example completion rates. For 60 usable households at 85% completion, 60 ÷ 0.85 = 70.6, so recruit 71. At 65% completion, 60 ÷ 0.65 = 92.3, so recruit 93.

Write the pass mark into the brief before recruiting. For example, set the share of households who say they would reuse the product. The result then cannot be argued after the fact.

NPD research vs market research and concept testing

NPD research is not a separate method. It is market research, usability testing and product testing organised around the gates of one product. Concept testing is one gate, "a market research method in which customers are presented with a description of a product or service" (OpenStax, Principles of Marketing).

Aspect
Scope
NPD research
Market research, usability testing and product testing organised around the gates of one product
Market research
Wider; also covers brand, advertising and segmentation
Concept testing
One gate in the process
Aspect
What it is
NPD research
Not a separate method
Market research
The wider field NPD research draws on
Concept testing
A market research method in which customers are presented with a description of a product or service
NPD research compared with related terms

How Qualfacto handles it

We recruit and run qualitative studies for the discovery, concept-reasons, prototype and home-use stages. Our formats are in-depth interviews, focus groups, digital diary studies, shop-alongs, ethnography, usability and app testing, and product testing (IHUTs).

We recruit by city, check participant identity before invitation, target by household and demographic profile, and run sessions in languages other than English. Moderators can be ours or yours. Deliverables such as recordings, transcripts, data exports and reports are agreed in the scope.

We have no fixed rate card; each project is quoted after we read your brief, and we offer a free pilot. Start from our guide to writing a market research brief, then share your brief with us (support@qualfacto.io) at support@qualfacto.io. Use WhatsApp for quick queries. We reply Monday to Friday, 10:00 to 18:00 Indian Standard Time (IST), and aim to answer within one business day.

Example

A concept survey of 150 people per concept gives a margin of error of about ±8 points at 95% confidence and a 50% score, from margin = 1.96 × √(0.25 ÷ n). A team that sets the kill threshold, X% choosing the concept over their current product, before fieldwork can read that result against it without arguing afterwards.

Frequently asked

Start with 9 to 17 one-to-one interviews with people who match your buyer, asking about the last time they faced the problem and what it cost them in rupees and hours. Then test a concept with focus groups or a survey, and check real use with a home trial. Write each stop rule first.
Free sources are enough for competitor, price and market-size checks. They cannot replace hearing from strangers who match your buyer, which needs recruitment and incentives. Do the desk work first so interviews can focus on what only people can tell you.
Primary research is new data collected for your product, such as interviews, groups and home trials. Secondary research uses data that already exists, such as reports, competitor pages and sales figures. Use secondary research to frame the question and primary research to answer it for your buyer.
At concept stage show a written description, because the aim is to test the idea rather than the design. For usability testing show a prototype. For a home trial give out the real product. A finished-looking mock-up shown too early makes people react to the design instead of the idea.

Sources

  1. 1.NIQ, "Beyond Vitality", 19 March 2025, NielsenIQ, 2025-03-19
  2. 2.Stage-Gate: The "Official" 2026 Version, Product Development and Management Association (PDMA), 2026-09-09
  3. 3.Sample sizes for saturation in qualitative research, Social Science & Medicine, 2022
  4. 4.Consumers' Purchase Intentions and their Behavior, Morwitz, 2014
  5. 5.Principles of Marketing, OpenStax

Questions about new product development research?

Share your brief with our team and we will help you match the right research method to each stage of your product.
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