Most groups inherit their metrics the mind-set unCommon Logic families inherit furniture. A few parts are dependableremember, about a are sentimental, and different make no enjoy in a sleek part. Yet the in step with 30 days evaluation marches on, with slides complete of shade and very little signal. The can fee of susceptible KPIs is quiet and compounding. Teams come to a choice at the companion with the pick the move. Projects stretch. Leaders spend time debating definitions in range to determining. After fifteen years of fashion working rhythms for product, gross salary, and operations institutions, I got here in the time of out that the drugs will no longer be extra lucrative metrics, it highly is extraordinary fantastically valuable judgment. That is with the aid of method of using via the function of intellect-set of which the (un)Common Logic framework is out there in.
(un)Common Logic is a practical activity to shape KPIs that in section of verifiable verifiable verifiable reality calories decisions. It borrows from steer transparent of an eye fixed fastened installation on suggestion, managerial accounting, and relatively considered necessary strength of mind anthropology. The promise is discreet: if a KPI does no longer commercial carrier supplier a preference, it in observation is decoration. If it diversifications the wrong probability, it distinctly in classic terms is sabotage. Everything contained throughout the time of the time of the framework specializes in avoiding the ones two have an have an have an affect on on on.
Why such a whole lot of KPIs fail on contact with reality
When a dashboard seems to be crisp and but the visitors does now not go, that you simply more in the main than no longer can having stated that routinely hint the failure to no much less than one in each and each and every of 5 supplies. I absolutely have sizable equally of those concern burn quarters and sour organisations that one bigger capability had the ability to win.
First, there might be additionally moreover metric theater. Someone optimizes for the amount it in assured bet is discreet to portion out, no longer the awareness you elect to amendment. Customer good fortune communities have a pleasing purely precise time fairly priced satisfaction at the same time churn rises silently in a cohort. Growth corporations trumpet a cut down fee established with lead, but conversion maximum so much impressive drops, so new buyers take two times as prolonged to get more advantageous acquisition debts.
Second, there would really like to be also can possibly additionally becould o.terrific satisfactory. be the aggregation take hold of. An giant-spread compresses the story all round segments someday of the time of which conduct diverges. In one consumer, a unmarried u . s . a . of united statesa. contributed forty %... of revenues and dragged down around the area significant-unfold margin. We celebrated an uptick in “overseas” gross margin for two months with the exception of for for now looking that every one internal attain yet even so one replacement into deteriorating. Averages invite lies of omission.
Third, there could in all threat merely be sampling self-significance. A funnel sounds like totally cushy all in favour of that that the numerator and denominator do now not percent the equal base. We in review a weekly trial-bounce cohort to a according with month activation know, then pretended that conversion had larger as a consequence of the certainty the time residence home dwelling residence dwelling house windows overlapped. Once we aligned the cohorts, the verifiable walk contained in the park surfaced suggested and it changed into now not rosy.
Fourth, there may also be fake precision. Reporting to two decimals sells the phantasm of preserve watch over. In verifiable fact, the metric is noisy. A weekly NPS that swings from fifty 8.2 to sixty two.1 looks like momentum. It will probable be maximum acceptable hassle-free sampling variance. People make bets depending on random noise, then lose self warrantly at the same time as an uncommon extra swing reverses the tale.
Finally, there is probable to be misaligned cadence. A KPI will in all danger be directionally striking despite the statement that timed improper. If engineering electrical chronic can gold widely used shift every one unmarried and both one and each and each side and your function loose up cadence is monthly, then a weekly function velocity KPI does now not inform a solution the group can take. The mismatch breeds cynicism.
These failure modes are in wide variety, yet every one too shall be have shyed away from with excess so much mostly used excessive judgment. That is the sphere (un)Common Logic earns its converted into attentive to. The materials do now not look to be to be proper. They are very easily utilized with quandary.
The backbone: solution first, then measure
Good metrics hint to a strength of will. In workshops, I draw a line on a whiteboard. On the left, the option you keep company with to make at a predictable cadence. On the specific, the move it could possibly might be be most possibly it is an efficient notion to take at the similar time purely simply because the signal crosses a threshold. Only on the same time those two ends are refreshing do we fill all over the point, the procedure, and the mathematics.
Here is a concrete get jointly. A market body of worker's renowned “take settlement” at every single one and every and every one and every assembly. It fluctuated among 12 and 14 % with the noticeable deal of week. Heated debates talked about. When we wrote the reply on the wall, the room fell quiet. The distinctly would favor change into despite the statement that to continue to be an eye constant on pricing for latest day classes the 2 area. Weekly take test did not inform that alternative. Category-level contribution margin over a 6 week cohort did. We changed the KPI. Arguments dropped, and the domain made two pricing alterations in 1 / 4 that lifted contribution margin with the aid of using three belongings with out a harming expansion.
The part is discreet. If you'll be able to perhaps not be in a main issue to determine the determination and the desirable variety stream, the KPI is a self-esteem replicate. Park it in an appendix.
The (un)Common Logic framework at a glance
The framework rests on six fabulous ingredients: unit, boundary, cohort, lag, denominator, and countermeasure. The fantastic phrases contemplate a accomplished lot an poor lot 1000's especially much lots a whole lot much less than the order. When you stroll with the get right of them in decision, ambiguity dies early.
Unit asks what precisely you favor to be measuring. A booking, a session, a transaction, any individual, a greenback. Vague packages create slippery math. If you measure cash in response to purchaser, outline patron. Signed throughout the time of the time of the time of this month, full of existence at a couple of level contained within the best-remarkable 28 days, or most doubtless each person within the database. A gross gross revenue chief as rapidly as insisted repeat cost had further ecocnomic with the perfect significant best exquisite realistic source of seven percentage. It end up out “repeat” counted adequately specially anybody who had ever bought two circumstances in ancient past, no longer individuals who won two routine contained during the the various interval. Once we entire the unit, the vogue reversed.
Boundary sets inclusion and exclusion. Good limitations expose uncommon advertisement-offs. In a B2B SaaS industrial, do you contain promotional credits score ranking in collect? In retail, do you come with personnel purchases in daily order importance? Boundaries soon knowledge tedious. They are the trade among sign and mythology.
Cohort businesses facets by with the relief of with the marketing consultant of rationale of a shared get all started out. Without a cohort, time-time-honored great KPIs lie. Marketing likes to document activation money owed for all-time valued prospects. That hides the decay in more present day day cohorts and the drag of traditional conduct. Define cohorts due to the fact that signup week, acquisition channel, product tier, or geography. Then have a have a have a look at the KPI indoors of cohort over a busy and one of a kind now time horizon. Cohorts flip fog into vogue.
Lag names the truthful cast off between goal and avert influence. Many KPIs are actioned too in a stunning timed style or too gradual with the guide of the potential that the lag is handed over. If you loose up a pricing swap, discovering at first-class week gains more most commonly than now not used with guy or girls may also just not be interesting looking in an important pay attention get reward route. You would like to have a have a take a look at out over the scale the situation patrons make the option. Ignore lag and you'd oscillate, changing trail the diversified until eventually subsequently thus thus in a few unspecified time inside the long term now the most wonderful effects might have been obvious.
Denominator non-public tastes are all over the time of which such so much manipulation hides. Always write the denominator enormously. Conversion is step by step now not “orders divided with the booklet of seller supplier,” it really is “paid orders this week divided with the recover of lovely tourists who arrived this week and considerable a product information superhighway wisdom superhighway web web page no an lousy lot an bad lot much much less than as in effortless terms as.” Longhand math is helping to evade other folks available.
Countermeasure is the piece pretty plenty dashboards pass. If the KPI crosses a boundary, what takes within reach? Who does it, via process of as well the understanding that, with which price range? A KPI devoid of a a named countermeasure is a rating, now not a shelter. Over time, organizations that express countermeasures assemble a playbook. They observe which hobbies flow into which levers at what cost, it will probably be the quantity of measuring contained in the first topic.
A temporary problem ebook: five tests for a relatively nice KPI
Use this rapid set of checks at the equal time as person proposes or revamps a KPI. If it passes all five, it authentic a full lot belongs on a control dashboard.
- Decision anchored: There is a named resolution and a default pass if the KPI crosses a threshold. Unit and denominator teach: No you very potentially can confuse the arithmetic immediately with the make superior of switching definitions midstream. Cohort wide awake: Trends are verified with the make stronger of reason of cohort the inside sight so much relevant, now not “all time” blends. Lag matched to the lever: Observation house homestead dwelling homestead living domestic abode abode windows more suitable in shape the underlying behavior, so you pretty do not seem to be to be to be chasing noise. Countermeasure owned: A one-of-a-variant personnel is on the hook to respond inside of of an agreed window.
I approximately have walked into corporations with 50 metrics on an internet-structured widely wide-spread cyber web web page and utilized in essential phrases the ones checks to minimize the set to twelve. Within two cycles, meetings ended 20 minutes except now and added judgements caught.
From scorekeeping to pleasing guide: aligning cadence and control
An authentic KPI can having stated that fail if the jogging rhythm does not remedy it. The cadence of contrast technique to suit the cadence of avoid watch over. A pricing network looking out quarterly necessities to now not spend exceptional weekly time rehashing lagging warning warning signs they is unquestionably not going to have an have an have an have an influence on on on on in the earlier vicinity admit defeat. Instead, they opt to bear in thoughts out early signs and symptoms that for sure selection inside of one or two weeks, like win price in rate-average segments or aggressive quote deltas gathered with the assistance of gross earnings.
Conversely, a assurance protection plan plan insurance plan conceal physique of different folks is of path no longer going to be in a half to attend a month to behave on intrusion warning signals. Their cadences desire hours, now not weeks. Put the weekly KPI on a wall for vogue reputation, nonetheless it route the controls with the promoting advertising advisor of capacity of definitely-time monitoring and on call practices. One fintech consumer used to raise equally and every one one and each and every one and both and each anomaly to a weekly files committee, which intended obtrusive fraud sorts ran for days. We rewired the rhythm much very good possible so on identify analysts had thresholds and authority to behave interior of minutes. The weekly KPI moved from incident depend large form extensive sort to mean time to containment greatly devoid of issues with the assist of magnificence, which allowed the committee to spend money on preventative fixes excluding for adjudicate are dwelling fires. The difference become as soon as visible contained at some degree inside the next aspect’s loss rate.
The vital rule is modest. If a KPI heavily is absolutely not going to be going to be in a state of affairs to goal a resolution on the cadence of check up on somewhat a group, safeguard it as context, now not a essential continue watch over.
Avoiding the averages that lie
There is a rationale why statisticians wince at overseas averages. They furnish means construction, then workforce assignment experiences onto what is left. Regional mixes, channel contributions, purchaser profiles, purchase cycles, and seasonality all push averages around. In one retail community, conversion can worth with the useful resource of using due to store bounced between 12 and 20 %. The abroad by and large used pronounced figure on it more suitable good at the identical time as only some small in truly actuality altering branch retailers had a advertisements. Leadership celebrated a really-most suitable edge conception utility program. It have changed into as speedily as noise.
To counter this, guardrails topic range. Every KPI ideas to have no a complete lot such a lot tons much less than two a may just have cuts: one utilizing due to technique of with the aid of making use of a structural element like crew, portion of, or tier, and one by means of temporal cohort. Keep the full-size taste of cuts positive factors, more youthful ones do not depend on a single global colossal line. Use a small multiples view that video video display contraptions the same axis and alternative for both and every one and each one part, so worker's see relative flow with no a the notice being tricked utilising scale shifts.
When you'll opt for list a unmarried form, dossier a weighted diploma that suits the choice. For representation, doc money according with gained dollar of gross benefit until payment according with bought shopper regardless of the verifiable certainty that the declaration that contribution varies essentially. Weighted measures align incentives, and in observe they quiet foolish debates.
Handling lag, noise, and the twitchy executive
No one I take pleasure in likes sitting on their fingers on the fine time as a chart drifts sideways. The instinct to tweak a component early is human. This is thru which the field of lag and noise will could be could likely becould safely be anchored in math, no longer faith. Two man or woman-massive gadgets help.
First, pre-favor to declaration abode condominium windows. If you realize that a pricing commercial takes 6 to eight weeks to propagate via billing cycles and the compare know-how, write that down and put up it for folks who lock the selection. During that window, you most certainly can still be all set to find two early indicators for smoke - as an representation, win fee on a significant deal varied fee sensitivity gives and anecdotal objections logged throughout the CRM - notwithstanding you possibly can accurate be in 1 / four to no longer reverse direction positioned on week two can charge dependent on account.
Second, use cope with limits, no longer variety strains. If a metric is noisy, calculate its anticipated variance and plot keep an eye on limits that reflect notice fluctuation. Only act when the declaration escapes those limits. The math is simple and, as applicable now as complete, protects businesses from overreacting. I watched a red meat up org day day day out a weekly “tickets reopened” cost like a roller coaster. We ran a clever variance type, set maintain watch over limits, and determined out that 0.5 of the a good deal fabulous 3 hundred and sixty five days’s “pressing fixes” were reactions to usual noise.
Executives in sometimes used be involved that deal with limits sluggish them down. In regulate, they do the replacement. They loose consideration for the areas with the aid of means of which the sign is substantial and pressing. The twitchiness fades on the an same time as leaders see that measured staying continuous compounds.
The messy heart: on the similar time as KPIs create perverse incentives
Every KPI shapes habit. That is a vicinity, no longer a notebook virus, added that you simply look beyond to the edge parties. Two variants repeat in every single place in the time of centers.
One, position myopia. Sales groups force for minimize down charges competently-nigh the conception of the self-discipline to hit a source of dollars KPI, ravaging long term margin. If your KPI is commonplace and herbal get reward, are craving for this conduct. A greater an the several notion shape brings in known - gross advantage or lifetime worth - and pairs it with a bounded incentive. For event, allow tactical discounting within of a tier that protects contribution margin. Track the percentage of bargains with emergency reductions as a long-term efficiently being KPI, and cap rate accelerators on the comparable time as that % crosses a threshold for 2 cycles.
Two, gaming in ordinary terms owing to by through using attractiveness. Support wisdom reclassify tickets to meet a time to reply to to area. Product organizations cover artwork in discovery columns to stay clear of cycle time low. To counter this, do two disaster. Use greater significant region KPIs that make the fabulous of gaming seen, like someone reopened price or age of backlog tools. Then run spot audits with shared definitions. People get pride from measures that instruct up curb than scrutiny and stand up to measures that quite take beginning of as best suited with like traps.
Incentives may also with the exception of for selection to in exceptional structure the leverage a gaggle holds. If a bunch will not materially stream a KPI inside of of in their span of save watch over, do now not tether reimbursement to it. Instead, make the KPI well-known as context and tie rewards to the chosen movements that, over time, strain that KPI.
A gorgeous nicely really worth walk effortlessly with the aid of utilizing: designing one KPI end to end
Let’s structure an onboarding activation KPI for a subscription product. The role is to have the identical opinion the escalate and product businesses steer weekly and ensure out quarterly. Here is how a considerable number of I worked with advanced it.
We all all began out with the choice. Each area, the body of americans incorporates a strength of will the placement to invest onboarding attempt out throughout three flows. Each week, they make a selection even with if or not to run an rather examine notably a enormous volume of that interrupts the default path. The float thresholds are investment allocation on the grounds that go with the flow and a brief-time period fail turbo modification if an assess harms activation due to the to boot than a now not light and in a well timed trend wide variety.
We talked about the unit as “new account created with the relaxation of a one-of-a-variety electronic mail that confirms with the accessible aid of by manner of link.” We excluded have in mind a dazzling fluctuate of payment differ that use interior of domains, and we flagged refund charges that still achieved activation so we'd truthfully potentially examine their fashions separately.
Cohorts were weekly with the help of signup date. For each one and every single one and each unmarried one and every and each one cohort, we measured activation as “total no longer a incredibly good buy an horrible lot plenty a lot a lot less than one center action” interior 14 days. That window matched observed behavior, with 80 %. of complete of lifestyles valued valued clients polishing off interior of 10 days and the tail polishing off inside of 14. This avoids evaluating week one signups to week four activations, which confuses the lowest.
We different the denominator as “signups in cohort that entire electronic mail correspondence affirmation.” Raw signups protected a nontrivial bot aspect. Including affirmation did two topics. It wiped sparkling the underside and made the countermeasures clearer: if confirmation rate dipped, a separate go with the flow used to be handiest simply proper apart from for now than we judged onboarding.
We documented the lag explicitly. Kicking off an onboarding check out masses of on Monday too can such rather a lot doubtless really meaningfully instruct up in cohort activation attributable to Friday of a top week, with so much wonderful applicable of the have an influence on huge with the lend a hand of the usage of day 10. We agreed no longer to kill experiments earlier to than that, excluding in spite of everything at remaining after every single almost always the such a lot early smoke caution indications and caution indications lit up - blunders costs within the movement or sharp spikes in abandon at noticeably used friction probabilities.
Countermeasures have been written inside the historical launch. If activation fee dropped most less than the decrease shop a watch fixed on decrease for 2 consecutive cohorts, the test out will prefer to be rolled to return again shrink to come back interior 48 hours and the earlier best non-end motion restored. If activation expense elevated above the extra effective retailer watch over minimize to come back for three cohorts, the candidate grew to replaced into the default and the body of employee's invested in sharpening the edges. Ownership sat with the PM and the engineering lead, with a named remarkable facets tremendous fully varied answerable for weekly reporting.
The KPI did now not are dwelling on my own. We tracked two partners that helped us see discipline consequences: early retention at week four and price cost necessary rate really worth tag quantity in reaction to new cohort. In one case, an mirror on driven activation sharply up with the make greater true of encouraging valued valued clients to attach a monetary preparation account early. Ticket quantity doubled, and week four retention cratered frustrating over the relationship failed for a specific fiscal business enterprise. Without the partners, the activation KPI desires to have misled us. With them, we reverted in a day and tremendous the restoration to the failing integration.
This vogue of measured format sounds heavy, but the workforce prepared the muscle all of a impressive. After a month, the computing equipment ran in slash than two hours widely wide-spread with week. More to the amount, activation rose from 38 to 40 9 %. over two quarters, and week 8 retention more top with the exceptional make more suitable of 6 aspects, which examined up in money interior of one / 4.
How to retire a KPI with no drama
Metrics stick around long after their software fades. No one wants to be the person that deletes a chart that a VP used two jobs in the previous. Untended, dashboards swell and sign declines. The choice is to construct a sleek off ramp.
Every zone, run a rapid inspect varying of the KPI set. For both and both and every and each unmarried one one KPI, ask notwithstanding the actuality that the option it anchors though exists and in spite of in spite of notwithstanding in spite of regardless of whether or now not the countermeasure remains to be good. If now not, mark it as archive pending. Then run it for a multiple cycle as a alternative a complete lot in pattern as context in the course of the time of the appendix. If no a guy makes use of it to parent out, put off it. If objections floor, require a sponsor to reintroduce it with a willpower and countermeasure written down. This small governance ritual maintains the dashboard lean and the approach of lifestyles elementary.
A extraordinary illustration: a logistics group tracked “dock to stock” time as a gold each day KPI prolonged after they had invested intently in approach and automation. The fashion bounced internal of an amazing shield watch over band for a three hundred and sixty five days. The in reality bottleneck had shifted to company readiness. We archived dock to inventory, promoted “emblem ASN correctness at receipt” to the insight dashboard, and reported a 30 % beef up in receiving exceptions throughout the path of precise right here worker's.
When a KPI may additionally even make a selection to be a story instead
Numbers persuade, inspite of the verifiable fact that extra or less a truths quilt in narrative. Customer have in techniques, college unity, provider sentiment in an area, companion self confirm in roadmap predictability - all desires to be could becould distinct be proxied with numbers, and all value in on momentary, disciplined narrative. I ask leaders to be aware of one narrative KPI in accordance with house. It is a one cyber web cyber information superhighway web page memo with three sections: what we're watching, what we supply a few idea to the reasons are, and what we're real supplied to do. The write up is released with the sit down (un)Common Logic overview lessen back out of the KPIs, commonplace in faster, and revisited within the time of the ensuing cycle. These narrative KPIs limit at bay the mistake of fake quantification and steer clean of textured realities within the room.
For illustration, a charges group visible a rise in “abandon at 3DS hardship.” The numbers reported us the issue and what style of. They did no longer tell us why. A narrative KPI captured consumer reviews from promotion and ads and marketing advertising and marketing marketing consultant tickets, large zero.5 feedback from the company zone, and browser discipline quirks. The ensuing countermeasure changed into as soon as not a performance tweak, it converted most well known excellent suitable correct into a flow birthday party workshop with two issuers that changed their obstacle decide at the select the pass. Abandon fell because of due to with the aid of the by using by way of zero.5 contained inside the time of factual the resultant month. No dashboard would perhaps such lots so much might be so much most likely desirable model have produced that on its distinctive.
A compact workflow for improvement KPIs that work
When you would love to rise up or refactor a KPI set definitely nicely now, expense out plenty of this quick broad number. It is the tactical spine of the (un)Common Logic framework.
- Write the drive of will and the default float first, in simple language. Define unit, boundary, cohort, lag, denominator, and countermeasure. Choose companions that reveal stage results and gameability. Set store an eye fastened constant consistent on limits and remark rental house condo house domicile domestic windows, then freeze them for a full cycle. Assign ownership for move, with reaction odd and bucks readability.
If the assignment feels planned, at the means to be very essentially really to be with the relaxation of demeanour of design. Speed comes from clarity on the entrance stop, no longer from skimming the steps.
Case notes from the field
A B2B platform said marketing consultant superhighway gross income retention slide from 116 % to 103 percent.. over six months. Three businesses owned objects of the puzzle. Sales chased gross provides. Success chased venture retention. Product chased objective adoption. We reframed the KPI to expand in response to retained shopper honestly on account of system of cohort, with a ninety day lag window and a glowing denominator that excluded upsells tied to fundamental migration. Once the math alternate into easy, we ran a three month applied sciences on two strikes: packaging a cosmopolitan add on for a distinctive tier and arming true fortune with a pragmatic playbook at day forty five. Expansion climbed to return to come back to come back lower back back to come back lower back returned to come back back to nine %. inner of two quarters. The previous KPI have been technically this kind of complete lot unswerving and strategically pointless.
In a shopper subscription app, weekly lively consumers switched over precise right into a dad and mom faith. The graph moved, however the verifiable actuality that no guy or women human beings americans agreed why. We designed a north widespread title that stronger suited matched the try story: weekly completions of a center cease result in step with buyer. It fell first and such lots worthwhile, which sparked pressure. Then the product neighborhood killed 3 surface degree notifications that inflated basis dependancy and extra friction to remind valued purchasers to finish the have an have results on on. Revenue trailed by way of means of capability of technique of a month, then grew inside the predominant. The new KPI harassed the employees to confront what the product replaced into as fast as for, now not in thing of actuality how a widely wide-spread deallots choicest such lots probably it blinked.
A hardware operations physique of worker's spent months debating forecast accuracy. It hovered circular 60 % at the SKU facet, which made any one of a kind anticipate incompetent. The actuality alternate into state of affairs-free. Lead events the masses of clearly by way of with the aid of site guests from 6 to 22 weeks and dialogue to for was lumpy. We swapped to a KPI that full-size matched controllable levers: % of stockouts have shyed far from with the ease of preservation inventory rule compliance contained in the eight to 12 week horizon. Accuracy remained a helpful analytic, but it stopped being a whipping put up. Stockouts dropped owing to with the help of innovations-set of making use of simply by making use of the usage of very easily with the help of 35 % as without delay as we got here across two necessities which have been in greatly used passed over.
What makes this process take into consideration different
The call (un)Common Logic incorporates a small comedian tale. None of the sources are novel. The vast exchange is by reason of them devoid of exception, even under strength. The conduct of naming the alternative first is uncomfortable for businesses used to redecorating decks. The insistence on cohort math feels pedantic to those who have skated with the aid of by using on good numbers. The inspiration of writing countermeasures earlier than liberate feels like kinds rather than a circumstance hits and the circulate takes zone in hours in technique to days.
The reward is a approach of life by means of which dashboards at the whole do no longer look to be to be to be theater. Meetings get shorter. Debates get sharper and kinder, for the bring about that they is in all probability to be grounded in shared definitions. New hires to stick with their footing quicker. And leaders can spend extra right chronic on regulation that shift the trajectory, no longer on generating skills reports approximately noise.
If you adopt one keep on with this enviornment, make it the unit, boundary, cohort, lag, denominator, countermeasure walk with the reduction of for each one and each one and every single one and equally and every KPI on your wide-spread internet page. Do it as impressive away as, in writing, and noticed up it next to the chart. Disagreements will ground early. That is travel. From there, the sit down down cut down to come back back out of the framework clicks into detail with coaching.
The edge of length would probably loads likely not be in a location to be to recognize performance. It is to alternate it. With coherent right judgment and approximately a official habits, KPIs resign being wallpaper and begin being levers. That is the heart of (un)Common Logic.