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Theory

Case: the Club survey that asked only members

Nazar's survey says half the Club's members would pay 650 for Club Plus. Add the people it never asked and the deposits that followed, then write the launch recommendation.

~5 min read · 9 exercises · 250 points

Before you start

Half the members said yes

Back at Klasna, end of January, for the module's case. Nazar reads his survey as 432 Club Plus members at 650 and wants to advertise Plus to new families too. You also have a second survey wave of people who left or never joined, and January's refundable deposits. How many will really buy, and to whom should Plus launch?

Start where the claim starts

Before challenging a plan, rebuild its own numbers. Nazar's plan rests on the November survey: 108 of the 220 responding members said they would «definitely» or «probably» buy Club Plus at 650, which is 49.09%.

Dataset · 380 rows

Club Plus price survey, November–December 2026

Every answer to the four-question survey about Club Plus (today's Club + two small-group speaking sessions a month with a tutor + a monthly progress report). Members answered in November (220 of 880); lapsed members and non-members in December. Prices in UAH a month, answered in round numbers.

respondent_idgroupwavetoo_cheap_uahbargain_uahgetting_expensive_uahtoo_expensive_uahbuy_plus_at_650
R001membernov_members450600750900probably
R002membernov_members450650800900maybe
R003membernov_members350550700800maybe
R004membernov_members400550700800maybe
R005membernov_members4006008001000definitely

First 5 of 380 rows

Download CSV

He then took two steps: scaled 49.09% to all 880 members (432 Plus members) and multiplied by the extra 200 a month (86,400 a month). Each step hides an assumption: that the 220 who replied speak for all 880, and that a stated yes becomes a payment.

The case tests both steps with the evidence Klasna gathered after November.

  • Do
    "108 / 220 = 49.09%; now test the jump to 880 and to payments."
  • Don't
    "Half said yes, so 432 will pay."

    Two untested steps in one sentence.

The people nobody asked

A survey of current members can't speak for people the offer is meant to attract. Klasna's December wave asked them: 60 people who left the Club in 2026 and 100 families and adults with lesson packages who never joined, with the same four questions.

Members put the acceptable range at 510–700; the 160 others at 310–450. For them today's Club at 450 is already at the top. 139 of 160 (86.88%) gave a «too expensive» price of 650 or less, against 1 of 220 members (0.45%), and only 2 of 160 said they'd buy Plus at 650.

Dataset: Club Plus price survey, November–December 2026 · shown above

The same price is unremarkable to people who already pay and out of reach for the people Nazar wants to advertise to.

  • Do
    "Members: 510–700. Lapsed and non-members: 310–450. Plus at 650 is for members."
  • Don't
    "It's the same Club, so the second wave won't differ."

    Their range ends where members' begins.

Said versus paid, by segment

In January everyone surveyed got a real offer: a refundable 200 deposit to hold a place in Club Plus from March, counted toward the first month. The results by segment: members who said yes 18 of 108, members who said maybe or no 4 of 112, members who never replied 9 of 660, lapsed 0 of 60, non-members 1 of 100.

Dataset · 5 rows

Club Plus deposits, January 2027

Refundable 200 UAH deposits for a place in Club Plus from March 2027, by segment. Members are split by their survey answer.

segmentpeopledeposits
member_said_yes10818
member_said_maybe_or_no1124
member_no_reply6609
lapsed_asked600
non_member_asked1001
Download CSV

Among the members who said «definitely» or «probably», 18 / 108 = 16.67% paid. Stated yes overstated real commitment about six times, the same pattern as NMT Sprint's ladder. Note too that 9 deposits came from members who never answered the survey at all.

  • Do
    "Of 108 yeses, 18 paid: 16.67%."
  • Don't
    "108 said yes, so 108 will join."

    Only 18 of them put money down.

Scale behaviour, not stated answers

Nazar scaled a stated share (49.09%) to all 880 members. The deposits give a share based on behaviour: 18 + 4 + 9 = 31 members out of 880, 3.52%. In the second wave, 1 deposit out of 160.

Dataset: Club Plus deposits, January 2027 · shown above

That's the number to plan on: about 31 Plus members at launch, mostly existing members upgrading. Some deposits will be refunded and a few people will join without one, so treat it as a first estimate with a small range around it, not an exact count.

  • Do
    "Plan on about 31, give or take a few."
  • Don't
    "49.09% of 880 is 432 Plus members."

    That scales words, not payments.

The best-supported launch estimate

Four estimates compete: 432 (49.09% of 880), 108 (everyone who said yes), about 500 (adding new families from ads), and about 31 (members who paid a deposit).

Only the last rests on behaviour with money on the table. 432 and 108 scale stated answers; 500 adds people whose acceptable range ends at 450 and who almost never said yes. So the first estimate is about 31: 31 × 200 = 6,200 a month of extra revenue before refunds, not 86,400.

  • Do
    "About 31 at launch: 6,200 a month extra, before refunds."
  • Don't
    "About 500 once the ads run."

    Those people's range ends at 450.

Revenue isn't what Plus adds

Even the corrected 6,200 a month is revenue, not what Klasna keeps. Each Plus member takes tutor time: two sessions a month at 450, shared by at most six people, so 2 × 450 / 6 = 150 a month per member in a full group.

After the 2.5% fee, Plus adds at most 200 × 0.975 − 150 = 45 a member over the Club, and less in groups that aren't full. For 31 members that's about 1,395 a month. Plus may still be worth it as a better product for some members, but not as the money-maker Nazar's plan described.

  • Do
    "At most 45 a member, about 1,395 a month for 31."
  • Don't
    "31 members bring 6,200 a month of profit."

    Tutor time and the fee come out first.

Launch small, to the people the evidence supports

The evidence says Plus at 650 is an upgrade for some existing members, not a way to bring new people in. So the plan: start small with the depositors (31 people is five or six groups), check who renews after the first month, and only then hire more tutors. Don't advertise Plus at 650 to new families: their own answers say no. Attracting them needs a different offer, which is what the next module covers.

How it fits together: rebuild the claim, ask the people the plan depends on, scale paid deposits rather than stated yeses, and judge the result on contribution. The next module asks what exactly Klasna and Dana should sell, starting with what the price grows with.

  • Do
    "Plus for the 31 depositors from March; check renewals before hiring."
  • Don't
    "Launch to everyone and run ads to new families."

    Their range ends at 450.

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