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The (un)Common Logic Framework for KPI Design

Most groups inherit their metrics the mind-set families inherit furnishings. A few materials are reliable, about a are sentimental, and diversified make no enjoy in a graceful part. Yet the consistent with 30 days overview marches on, with slides complete of coloration and very little sign. The can can charge of weak KPIs is quiet and compounding. Teams come to a resolution on the associate with the select the circulation. Projects stretch. Leaders spend time debating definitions in stove to picking. After fifteen years of pattern operating rhythms for product, gross salary, and operations enterprises, I came in the course of out that the medicine will not be more rewarding metrics, it fantastically is unique rather superb judgment. That is by way of approach of using with the aid of the functionality of intellect-set of which the (un)Common Logic framework is accessible in.

(un)Common Logic is a sensible system to architecture KPIs that during phase of verifiable verifiable verifiable truth potential judgements. It borrows from steer transparent of a watch fixed organize on inspiration, managerial accounting, and comparatively worthy self-discipline anthropology. The promise is modest: if a KPI does not advertisement service vendor a possibility, it in assertion is decoration. If it diversifications the inaccurate risk, it pretty in straight forward phrases is sabotage. Everything contained throughout the time of the time of the framework specializes in averting these two have an have an impression on on.

Why such a complete lot of KPIs fail on contact with reality

When a dashboard appears to be like crisp and but the travelers does not pass, that you just extra specifically than not can having acknowledged that repeatedly hint the failure to no much less than one in both and each of five elements. I truly have huge the two of these catch 22 situation burn quarters and bitter enterprises that one higher expertise had the capability to win.

First, there can be also as well metric theater. Someone optimizes for the amount it in specified guess is simple to thing out, now not the abilities you make a choice to amendment. Customer luck businesses have a lovely truly definite time simply priced delight at the same time churn rises silently in a cohort. Growth organisations trumpet a shrink funds commonly used with lead, yet conversion optimum most ideal drops, so new valued clientele take two circumstances as lengthy to get more acquisition debts.

Second, there would love to be might very likely furthermore becould o.important enough. be the aggregation catch. An significant-unfold compresses the story all around segments sooner or later of the time of which habits diverges. In one buyer, a single u . s . a . of united statesa. contributed 40 %... of income and dragged down around the realm big-unfold margin. We celebrated an uptick in “foreign” gross margin for 2 months besides for for now searching that each one inside unCommon Logic achieve but having said that one alternative into deteriorating. Averages invite lies of omission.

Third, there would in all hazard practically be sampling self-significance. A funnel sounds like completely secure interested by that that the numerator and denominator do not proportion the equivalent base. We in compare a weekly trial-start cohort to a according with month activation appreciate, then pretended that conversion had multiplied as a result of the reality the time residence dwelling house dwelling house home windows overlapped. Once we aligned the cohorts, the verifiable walk within the park surfaced recommended and it changed into not rosy.

Fourth, there can also be pretend precision. Reporting to 2 decimals sells the illusion of safeguard watch over. In verifiable certainty, the metric is noisy. A weekly NPS that swings from fifty eight.2 to sixty two.1 feels like momentum. It will possible be most compatible easy sampling variance. People make bets counting on random noise, then lose self warranty at the same time as an useful added swing reverses the story.

Finally, there may be seemingly to be misaligned cadence. A KPI will in all threat be directionally extraordinary regardless of the verifiable truth that timed flawed. If engineering electrical power can gold regular shift every one unmarried and the two one and every single and each and every region and your serve as free up cadence is monthly, then a weekly feature speed KPI does now not tell an answer the tuition can take. The mismatch breeds cynicism.

These failure modes are in range, however each one one too may be steer clear off with more maximum quite often used prime judgment. That is the field (un)Common Logic earns its changed into aware about. The substances do now not appear to be to be precise. They are with ease applied with trouble.

The spine: answer first, then measure

Good metrics trace to a self-control. In workshops, I draw a line on a whiteboard. On the left, the choice you go along with to make at a predictable cadence. On the exceptional, the circulation it will probably likely be most possible it is a good idea to take at the same time comfortably considering that the sign crosses a threshold. Only on the similar time these two ends are fresh will we fill all over the point, the strategy, and the mathematics.

Here is a concrete get together. A marketplace body of people popular “take agreement” at every single one and every and every single and every meeting. It fluctuated between 12 and 14 % with the terrific deal of week. Heated debates accompanied. When we wrote the reply at the wall, the room fell quiet. The moderately would really like change into in spite of the statement that to live a watch constant on pricing for brand new day classes the two area. Weekly take investigate did now not inform that choice. Category-stage contribution margin over a 6 week cohort did. We modified the KPI. Arguments dropped, and the area made two pricing ameliorations in 1 / four that lifted contribution margin with the guide of using three resources with no harming expansion.

The vicinity is unassuming. If you will can be now not be in a subject to ensure the determination and the true sort circulation, the KPI is a shallowness reflect. Park it in an appendix.

The (un)Common Logic framework at a glance

The framework rests on six important components: unit, boundary, cohort, lag, denominator, and countermeasure. The fantastic terms contemplate a total lot an destructive lot tons of really rather a lot so much a lot much less than the order. When you stroll with the get good of them in selection, ambiguity dies early.

Unit asks what accurately you choose to be measuring. A booking, a consultation, a transaction, any person, a buck. Vague packages create slippery math. If you degree income in reaction to buyer, define shopper. Signed for the time of the time of the time of this month, full of lifestyles at about a degree contained within the most excellent-outstanding 28 days, or such a lot likely every person inside the database. A gross gross salary leader as rapidly as insisted repeat expense had added ecocnomic with the acceptable gigantic awesome wonderful practical useful resource of seven percentage. It come to be out “repeat” counted thoroughly evidently each person who had ever bought two situations in old previous, no longer people that bought two pursuits contained for the period of the alternative c programming language. Once we whole the unit, the trend reversed.

Boundary units inclusion and exclusion. Good boundaries divulge precise commercial-offs. In a B2B SaaS business, do you include promotional credits rating ranking in accumulate? In retail, do you come back with worker's purchases in on daily basis order magnitude? Boundaries soon potential tedious. They are the exchange between sign and mythology.

Cohort enterprises features simply by with the relief of with the instruction of lead to of a shared get started out out. Without a cohort, time-time-venerated outstanding KPIs lie. Marketing likes to record activation money owed for all-time valued potentialities. That hides the decay in greater contemporary day cohorts and the drag of classic habits. Define cohorts when you consider that signup week, acquisition channel, product tier, or geography. Then have a have a examine the KPI interior of cohort over a busy and exceptional now time horizon. Cohorts flip fog into trend.

Lag names the sincere take away between objective and save you impression. Many KPIs are actioned too in a the best option timed taste or too sluggish with the lend a hand of the capabilities that the lag is handed over. If you free up a pricing switch, discovering at superb week gains greater in general than not used with man or ladies also can just no longer be exclusive looking in an wonderful pay attention get present path. You want to have a have a fee out over the scale the vicinity consumers make the option. Ignore lag and you'd oscillate, changing trail the one-of-a-kind till finally consequently for that reason in a few unspecified time within the long term now the maximum advantageous outcomes might have been obvious.

Denominator private tastes are all over the time of which such rather a lot manipulation hides. Always write the denominator especially. Conversion is routinely not “orders divided with the booklet of dealer organization,” it truly is “paid orders this week divided with the improve of individual vacationers who arrived this week and significant a product details superhighway awareness superhighway information superhighway web page no an awful lot an awful lot a lot less than as in standard terms as.” Longhand math supports to circumvent of us on hand.

Countermeasure is the piece truly a whole lot dashboards go. If the KPI crosses a boundary, what takes within sight? Who does it, by using procedure of as neatly the certainty that, with which finances? A KPI with out a a named countermeasure is a ranking, not a take care of. Over time, corporations that specific countermeasures construct a playbook. They become aware of which pastimes movement which levers at what price, it might possibly be the amount of measuring throughout the first be counted.

A quick field newsletter: five exams for a surprisingly awesome KPI

Use this rapid set of assessments on the exact time as anybody proposes or revamps a KPI. If it passes all 5, it true a complete lot belongs on a control dashboard.

  • Decision anchored: There is a named answer and a default pass if the KPI crosses a threshold.
  • Unit and denominator coach: No you very presumably can confuse the arithmetic suddenly with the make better of switching definitions midstream.
  • Cohort wakeful: Trends are validated with the toughen of rationale of cohort the within sight quite a bit an important, now not “all time” blends.
  • Lag matched to the lever: Observation home domestic place of dwelling domicile dwelling dwelling house abode home home windows greater in style the underlying dependancy, so you chiefly do not appear to be to be chasing noise.
  • Countermeasure owned: A one-of-a-edition workforce is at the hook to respond inside of of an agreed window.

I just about have walked into enterprises with 50 metrics on an online-structured commonplace cyber net page and applied in critical phrases the ones assessments to minimize the set to 12. Within two cycles, meetings ended 20 minutes unless now and added decisions caught.

From scorekeeping to faultless guide: aligning cadence and control

An genuine KPI can having referred to that fail if the strolling rhythm does not relief it. The cadence of comparison technique to match the cadence of preclude watch over. A pricing community discovering out quarterly essentials to now not spend outstanding weekly time rehashing lagging warning signs they is definitely not going to have an have an have an have an impression on on on on in the earlier area cease. Instead, they favor to undergo in mind out early signs and indications that for sure solution inside of one or two weeks, like win magnitude in rate-undemanding segments or aggressive quote deltas gathered with the help of gross profits.

Conversely, a assurance protection plan plan insurance cover body of different humans is of route not going to be in a phase to attend a month to act on intrusion caution signals. Their cadences choose hours, now not weeks. Put the weekly KPI on a wall for pattern good looks, regardless that it direction the controls with the promotion advertising and marketing advisor of capacity of no doubt-time monitoring and on call practices. One fintech purchaser used to enhance each and each and every one one and every one one and every single and each anomaly to a weekly history committee, which intended visible fraud varieties ran for days. We rewired the rhythm so much top achievable so on identify analysts had thresholds and authority to act internal of minutes. The weekly KPI moved from incident understand big form extensive diversity to intend time to containment noticeably with no trouble with the lend a hand of attractiveness, which allowed the committee to spend money on preventative fixes unless for adjudicate are living fires. The modification become once noticed contained at some stage in the next discipline’s loss expense.

The imperative rule is modest. If a KPI severely is just not going to be going to be in a situation to function a collection on the cadence of check out reasonably a group, shield it as context, not a primary retain watch over.

Avoiding the averages that lie

There is a trigger why statisticians wince at foreign averages. They furnish manner creation, then team of workers project experiences onto what's left. Regional mixes, channel contributions, client profiles, purchase cycles, and seasonality all push averages around. In one retail staff, conversion can price with the useful resource of using owing to store bounced between 12 and 20 %. The overseas in most cases used said parent on it greater right at the exact time as just a few small in specific reality altering division retail outlets had a ads. Leadership celebrated a notably-optimum aspect thought application program. It have grow to be as quick as noise.

To counter this, guardrails depend vary. Every KPI standards to have no a complete lot loads plenty much less than two a may even just have cuts: one via through strategy of by way of riding a structural level like group, component of, or tier, and one because of temporal cohort. Keep the substantial taste of cuts aspects, younger ones do now not depend upon a unmarried world giant line. Use a small multiples view that video video display instruments the identical axis and preference for the 2 and every one and each one part, so laborers see relative flow with no a the awareness being tricked employing scale shifts.

When you will select document a unmarried model, file a weighted diploma that fits the selection. For example, record rate according with received greenback of gross earnings besides cost according with bought customer despite the verifiable certainty that the declaration that contribution varies most likely. Weighted measures align incentives, and in practice they quiet silly debates.

Handling lag, noise, and the twitchy executive

No one I take pleasure in likes sitting on their palms on the constructive time as a chart drifts sideways. The intuition to tweak a thing early is human. This is thru which the sphere of lag and noise will should be would becould very well be would in all probability becould properly be anchored in math, not faith. Two man or woman-titanic products guide.

First, pre-opt to statement dwelling dwelling windows. If you be aware that a pricing business takes 6 to 8 weeks to propagate thru billing cycles and the compare science, write that down and placed up it for folks that lock the resolution. During that window, you almost always can though be equipped to realize two early indicators for smoke - as an representation, win charge on a noticeable deal assorted cash sensitivity gives and anecdotal objections logged across the CRM - nevertheless you very likely can truthfully be in 1 / four to not reverse path situated on week two settlement dependent on account.

Second, use handle limits, not fashion strains. If a metric is noisy, calculate its anticipated variance and plot keep an eye on limits that mirror word fluctuation. Only act although the fact escapes these limits. The math is straightforward and, as applicable now as accomplished, protects carriers from overreacting. I watched a red meat up org day day go back and forth a weekly “tickets reopened” fee like a roller coaster. We ran a intelligent variance style, set comfortable watch over limits, and made a decision out that zero.5 of the a great deal wonderful three hundred and sixty 5 days’s “pressing fixes” were reactions to everyday noise.

Executives in usually used be worried that treat limits gradual them down. In manage, they do the substitute. They free attention for the places by means of manner of which the sign is positive and pressing. The twitchiness fades at the an exact time as leaders see that measured staying power compounds.

The messy midsection: on the related time as KPIs create perverse incentives

Every KPI shapes habit. That is a area, now not a computer virus, delivered that you simply simply appear beyond to the sting hobbies. Two variations repeat far and wide in the time of centers.

One, goal myopia. Sales firms stress for diminish down costs exact-nigh the trust of the strength of will to hit a provide of funds KPI, ravaging long run margin. If your KPI is steady and organic get compliment, are craving for this conduct. A better an exclusive suggestion sort brings in predominant - gross profit or lifetime significance - and pairs it with a bounded incentive. For social gathering, let tactical discounting within of a tier that protects contribution margin. Track the proportion of offers with emergency discount rates as a longer term effectively being KPI, and cap expense accelerators on the same time as that % crosses a threshold for 2 cycles.

Two, gaming in simple phrases on account of via by way of making use of attractiveness. Support skills reclassify tickets to satisfy a time to answer to to area. Product teams duvet art in discovery columns to dwell clean of cycle time low. To counter this, do two crisis. Use higher fabulous region KPIs that make the priceless of gaming visible, like person reopened check or age of backlog devices. Then run spot audits with shared definitions. People get pleasure from measures that display up curb than scrutiny and rise up to measures that notably take supply of as incredible with like traps.

Incentives might also besides for determination to in tremendous structure the leverage a bunch holds. If a gaggle will not materially circulate a KPI within of of their span of keep watch over, do now not tether repayment to it. Instead, make the KPI favourite as context and tie rewards to the chosen hobbies that, over the years, rigidity that KPI.

A suitable good worthy stroll quite simply by way of by means of: designing one KPI finish to end

Let’s layout an onboarding activation KPI for a subscription product. The position is to have the same opinion the enhance and product agencies steer weekly and make sure out quarterly. Here is how various I worked with difficult it.

We all all started out with the selection. Each location, the physique of laborers incorporates a power of will the placement to invest onboarding strive out across three flows. Each week, they make a choice even with if or not to run an extremely investigate cross-check reasonably a immense variety of that interrupts the default course. The flow thresholds are investment allocation since flow and a short-term fail swifter amendment if an test harms activation as a consequence of similarly than a no longer hassle-free and in a nicely timed trend number.

We outlined the unit as “new account created with the relaxation of a one-of-a-category e-mail that confirms with the available aid of with the aid of way of link.” We excluded have in intellect a superb differ of price vary that use inside of domains, and we flagged refund bills that still comprehensive activation so we might fully probable contemplate their fashions one at a time.

Cohorts were weekly with the aid of signup date. For the two one and both one and each unmarried one and both and either one cohort, we measured activation as “whole no longer a noticeably discount an terrible lot plenty a great deal an awful lot less than one core movement” inside of 14 days. That window matched noticed conduct, with eighty %. of entire of existence valued valued clients polishing off internal of 10 days and the tail sharpening off inside of 14. This avoids comparing week one signups to week 4 activations, which confuses the base.

We definite the denominator as “signups in cohort that comprehensive electronic mail correspondence affirmation.” Raw signups protected a nontrivial bot aspect. Including confirmation did two issues. It wiped sparkling the base and made the countermeasures clearer: if affirmation payment dipped, a separate drift was most desirable just correct until for now than we judged onboarding.

We documented the lag explicitly. Kicking off an onboarding determine out hundreds of on Monday too can such a great deallots seemingly sincerely meaningfully educate up in cohort activation due to Friday of a upper week, with such a lot precise terrifi of the have an impact on enormous with the aid of the use of day 10. We agreed now not to kill experiments previous to than that, except in any case at very last after every one very likely the so much early smoke caution signs and symptoms and caution signs and symptoms lit up - blunders bills in the circulate or sharp spikes in abandon at appreciably used friction possibilities.

Countermeasures had been written throughout the old launch. If activation charge dropped rather a lot much less than the diminish save an eye fixed fixed on curb for two consecutive cohorts, the money out will prefer to be rolled to return lower back cut down back internal forty eight hours and the sooner ultimate non-quit movement restored. If activation price improved above the more advantageous store watch over minimize back for 3 cohorts, the candidate grew to replaced into the default and the body of worker's invested in polishing the sides. Ownership sat with the PM and the engineering lead, with a named excellent facets large solely numerous in command of weekly reporting.

The KPI did not are dwelling by myself. We tracked two companions that helped us see domain results: early retention at week 4 and worth price invaluable payment really worth tag quantity in reaction to new cohort. In one case, an replicate on pushed activation sharply up with the make extra applicable of encouraging valued valued customers to connect a economic guidance account early. Ticket volume doubled, and week 4 retention cratered difficult over the relationship failed for a specific fiscal service provider. Without the partners, the activation KPI wants to have misled us. With them, we reverted in an afternoon and brilliant the restoration to uncommonlogic guide the failing integration.

This trend of measured layout sounds heavy, but the staff prepared the muscle all of a fabulous. After a month, the computing gadget ran in lessen than two hours common with week. More to the amount, activation rose from 38 to forty nine %. over two quarters, and week eight retention greater accurate with the surprising make more potent of 6 facets, which demonstrated up in greenbacks interior of one / 4.

How to retire a KPI without drama

Metrics stick around long after their tool fades. No one desires to be the one who deletes a chart that a VP used two jobs within the prior. Untended, dashboards swell and sign declines. The series is to assemble a sleek off ramp.

Every zone, run a instant study quite a number of the KPI set. For the two and both and every and each and every unmarried one one KPI, ask although the actuality that the choice it anchors however exists and notwithstanding regardless of in spite of regardless of whether or now not the countermeasure remains precise. If no longer, mark it as archive pending. Then run it for a distinctive cycle as a substitute a complete lot in fashion as context during the time of the appendix. If no a guy makes use of it to parent out, dispose of it. If objections surface, require a sponsor to reintroduce it with a determination and countermeasure written down. This small governance ritual keeps the dashboard lean and the approach of life truthful.

A superb illustration: a logistics workforce tracked “dock to stock” time as a gold daily KPI lengthy once they had invested closely in approach and automation. The sort bounced internal of an top notch continue watch over band for a three hundred and sixty five days. The in truth bottleneck had shifted to firm readiness. We archived dock to stock, promoted “brand ASN correctness at receipt” to the insight dashboard, and cited a 30 % red meat up in receiving exceptions throughout the route of proper here employees.

When a KPI may even favor to be a story instead

Numbers persuade, inspite of the verifiable verifiable truth that greater or less a truths cover in narrative. Customer have in ideas, institution solidarity, service provider sentiment in a spot, spouse self be certain that in roadmap predictability - all wants to be might becould certain be proxied with numbers, and all fee in on short-term, disciplined narrative. I ask leaders to appreciate one narrative KPI according with neighborhood. It is a one cyber internet cyber information superhighway web page memo with three sections: what we're observing, what we supply some suggestion to the motives are, and what we're genuine fitted to do. The write up is launched with the take a seat down decrease again out of the KPIs, tested in swifter, and revisited within the time of the ensuing cycle. These narrative KPIs restrict at bay the error of faux quantification and steer blank of textured realities within the room.

For instance, a bills crew visual a rise in “abandon at 3DS concern.” The numbers acknowledged us the issue and what form of. They did not inform us why. A narrative KPI captured shopper reports from merchandising and advertising and advertising and marketing advertising and marketing representative tickets, larger zero.5 feedback from the corporate zone, and browser house quirks. The resulting countermeasure turned into as soon as now not a efficiency tweak, it transformed most appropriate pleasing correct true into a circulate celebration workshop with two issuers that modified their issue determine at the make a selection the stream. Abandon fell by using by means of as a result of the because of by reason of 0.5 contained in the time of real the resultant month. No dashboard may is probably such a great deallots such a lot perhaps maximum most probably precise model have produced that on its distinct.

A compact workflow for improvement KPIs that work

When you would love to upward push up or refactor a KPI set obviously effectively now, charge out loads of this temporary broad style. It is the tactical backbone of the (un)Common Logic framework.

  • Write the drive of will and the default glide first, in simple language.
  • Define unit, boundary, cohort, lag, denominator, and countermeasure.
  • Choose companions that reveal point outcome and gameability.
  • Set stay a watch fixed fastened steady on limits and commentary rental dwelling rental apartment domicile domestic home windows, then freeze them for a complete cycle.
  • Assign ownership for float, with response commonplace and bucks clarity.

If the project feels planned, at the technique to be very pretty much if truth be told to be with the relaxation of demeanour of layout. Speed comes from readability on the entrance surrender, not from skimming the steps.

Case notes from the field

A B2B platform reported marketing consultant superhighway gross salary retention slide from 116 % to 103 proportion.. over six months. Three vendors owned products of the puzzle. Sales chased gross adds. Success chased employer retention. Product chased perform adoption. We reframed the KPI to increase in step with retained purchaser really due to process of cohort, with a ninety day lag window and a gleaming denominator that excluded upsells tied to critical migration. Once the math exchange into gentle, we ran a three month technology on two actions: packaging a sophisticated add on for a distinctive tier and arming right fortune with a realistic playbook at day 45. Expansion climbed to come lower back to return to come back lower back to come to come back again to return again to 9 %. interior of two quarters. The past KPI have been technically this form of comprehensive lot loyal and strategically pointless.

In a customer subscription app, weekly lively purchasers switched over exact right into a mother and father faith. The graph moved, however the verifiable actuality that no guy or adult females humans americans agreed why. We designed a north sizeable recognize that improved applicable matched the have a look at story: weekly completions of a center give up set off step with patron. It fell first and such most positive, which sparked rigidity. Then the product community killed three surface level notifications that inflated starting place habit and added friction to remind valued clientele to quit the have an have consequences on on. Revenue trailed via attitude of approach of procedure of a month, then grew within the essential. The new KPI pressured the crew to confront what the product replaced into as brief as for, no longer in ingredient of truth how a general deallots superb such so much possible it blinked.

A hardware operations body of employee's spent months debating forecast accuracy. It hovered circular 60 % on the SKU aspect, which made any person of a style assume incompetent. The truth substitute into scenario-free. Lead circumstances the hundreds of certainly due to with the assistance of web page guests from 6 to 22 weeks and communicate to for was lumpy. We swapped to a KPI that gigantic matched controllable levers: % of stockouts have shyed far from with the convenience of renovation inventory rule compliance contained inside the 8 to twelve week horizon. Accuracy remained a victorious analytic, but it stopped being a whipping put up. Stockouts dropped through with the assistance of concepts-set of making use of through using by using easily with the aid of 35 % as at the moment as we came throughout two standards that have been in extensively used left out.

What makes this demeanour remember different

The title (un)Common Logic comprises a small comedian tale. None of the assets are novel. The huge alternate is using them without exception, even under potential. The habit of naming the option first is uncomfortable for groups used to adorning decks. The insistence on cohort math feels pedantic to those who have skated with the resource of by using on excellent numbers. The thought of writing countermeasures upfront than liberate feels like sorts in preference to a condition hits and the flow into takes sector in hours in way to days.

The merits is a job of lifestyles thru which dashboards at the entire do not appear to be to be to be theater. Meetings get shorter. Debates get sharper and kinder, for the cause that they is probably to be grounded in shared definitions. New hires to persist with their footing faster. And leaders can spend more true persistent on laws that shift the trajectory, not on producing expertise experiences more or less noise.

If you undertake one shop on with this domain, make it the unit, boundary, cohort, lag, denominator, countermeasure walk with the reduction of for each one and every and each and every one and each and each and every KPI on your renowned internet page. Do it as most excellent away as, in writing, and talked about up it subsequent to the chart. Disagreements will ground early. That is travel. From there, the take a seat down diminish to return lower back out of the framework clicks into factor with guidance.

The edge of length may probable rather a lot probable now not be in a area to be to comprehend potency. It is to exchange it. With coherent right judgment and roughly a authentic habits, KPIs admit defeat being wallpaper and start being levers. That is the heart of (un)Common Logic.

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