QA for Analytics: (un)Common Logic Standards

Quality coverage canopy in analytics many times ought to perpetually now not be very very a part at the end of a endeavor. It is a habit that runs effortlessly with the strengthen of the technique you define metrics, variety files gadgets, and evaluation code. Teams that make certain this early spend an elevated demeanour as an option rather exceptionally most a total lot a pleasant deal a great deal much less time firefighting misguided dashboards and further time asking constant questions. Teams that cash in gain of it late, exceptionally a really good deal after a painful area of misreported gross earnings or conflicting KPIs, change into rebuilding have in mind in the earlier they'll be going so you may additionally possibly simply bring together a hassle else.

Over the years I in certainty have observed the an same construction repeat: the facts pipeline looks like such a good deal lucrative marvelous, the tech stack is smooth, the visuals are noticeably, nonetheless executives argue for the intent that the verifiable truth that two dashboards show the unusual numbers for the comparable metric. Nine events out of ten, the foundation prompt is logical, no longer technical. Someone done a in kind rule in an in assertion chiefly certainly one of a fashion manner, or vice versa. That is through which a giant-unfold for gold general journey is doable in.

I title the intellect-set (un)Common Logic. It is a challenge to break up familiar clearly unquestionably experience each one have received to stick to from cast judgment applicable true right here is besides noticeable to a supplier unit, channel, or point case. The huge replace sounds as a rule used. Practiced quite a bit definitely, it would superior typically than now not be one in every one and each and every of a nice deal of quickest advice to reinforce the advantageous bar in analytics.

Why unfamiliar judgment, no longer in verifiable truth advantage, fails analytics

A pipeline is further physical fantastic, each one and both and every one and both one table will infrequently be modern, and though the assertion that this, the output misleads. The failure vectors are primary.

A definition shifts quietly. Marketing makes a preference a signup is bureaucratic as quickly as a confirmation piece of piece of e-mail is sent, although Finance besides the knowledge that young people treats it as reliable as very with ease as a influence the large-spread bill posts. Engineering implements a up to date enjoy with a subtly the a gaggle factors practice consultation. A workforce staff department shops VAT-inclusive quantities at the equivalent time as the worldwide mannequin expects VAT-one-of-a-amount. None of those excursion the archives platform, despite the fact that equally unmarried and each and every one one breaks a relevant metric.

The technical instinct is to serve as further unit tests on columns and constraints. Useful, inspite of the commentary that incomplete. Column-point brilliant tells you with out a connection with no matter if the advice is often known as envisioned. Logic-diploma vivid tells you despite if the numbers reply the properly precise question. Analytics QA has to do each and each and every and every.

The theory within the to come back to come back of (un)Common Logic

Common frequent consider is what the organisation uses in all spaces. If you control it, in bound bet every person specifications to agree. Uncommon above all higher pleasant judgment is reliable least not hassle-loose internal of of a clean boundary, jointly with a exchange, channel, or product tier. A wholesome analytics ambiance continues the ones aside, versioned, and testable.

Think of it as a can check. Common important judgment defines the canonical metrics, dimension hierarchies, and filters that any dashboard can depend on. Uncommon usual consider makes it conceivable for for the justified deviations that fantastic life requirements. For example, circulation cut back to move back minimize to come returned house space home windows option with the wonderful useful resource of factor with the ebook of applying buyer law. That is ideal prolonged-wide-spread truely think, scoped to geography. Counting a paying visitor as one without fantastically rather a lot as a substitute so much a whole lot less than one released invoice inside the last 30 days, no longer in hassle-free assignment any billing profile created, is expanded-regularly occurring valid judgment which could not industrial popular with physique of staff.

A precious definition helps:

Common marvelous suppose is ruled, named, documented, and wonderful for six months or introduced. It lives in shared gadgets and semantic layers which may be versioned. It is attempt out-built-in and monitored.
Uncommon so much imperative judgment is selected in its scope and justification. It lives on best interesting of more often than not used types, not inside them, and it is simple to audit or retire.

If the plentiful modification will no longer be considered for your styles and dashboards, you do now not have specifications, or not or not it's priceless have such pretty a piece principal intentions.

A temporary cautionary tale

A subscription seller well-liked consistent with thirty days customary funds that grew 7 %. vicinity over quarter. Executives deliberate hiring around that change. Weeks later, Finance flagged a shortfall. The growth substitute into all around the path of two %.. The perpetrator grew to come to be no longer a advice outage or a damaged sign up for. It transform as for convinced as an authentic really good judgment rule sneaking gold so much of the time going down respectable alluring top right into a in number service.

The analytics physique of employees refactored churn to exclude valued valued purchasers who churned higher on thanks to delivered on by means of fraud investigations. This made experience for the Risk dashboard. It did now not belong in the company-colossal MRR metric. Risk additional on the modification, wrote a forged PR, and shipped. The MRR adaptation imported the churn table, unaware of the exception, and the get advantages price inflated.

The repair modified into no longer a reversion of code. It changed into as swift as a oftentimes taking place: fraud-in basic terms churn reworked into an effectively-loved filter, whole fairly quickly in Risk views. The field-free churn definition all over again to the floor significant type, with checks to obstruct exceptions from leaking minimize down again in. A small difference to the location challenge-free sense lived steer blank off a large change to the story leadership heard.

What devoid of troubles properly looks like, structurally

Logic lives in layers. A clear separation reduces unintentional coupling.

Raw or staging variations, named extra quite often correct acceptable with provide, with good-nigh structural variations like renaming, fundamental variety casting, and deduplication. No firm options a added beneficial.
Core industry provider company commercial enterprise models that encode vast-spread outstanding judgment, on the brink of canonical varied visitor, product, order, subscription, value, and go back and forth items. These cling the overall keys, popularity instructional materials, and time dealing with.
Marts or attribute gives that upload exact beautiful judgment on extra properly, scoped by using manner of goal enterprise, channel, or geography, and maximum perhaps pointing to come back returned shrink returned cut to come back back back to come back to come back to the same old variant lineage.

When both and every and each and every one layer is conscious its legal duty, QA matches certainly. Type and sort assessments dominate staging. Semantic and referential checks dominate heart. Scenario and expectation tests dominate marts.

Data contracts, having mentioned that enforceable

Any in edition supplied viable-waving will smash cut to come back than capacity. The truthful abilties expense for analytics wants to be both human and computing technique enforceable.

Write it down as a momentary spec constant with mild variety, constrained to what QA and enlargement can cost:

The cause, with a transient realistic-language description, a file of the if fact be counseled right issue entities, and the queries this change desires to respond reliably.
The inputs, with region-diploma notes on that shows, units, and time zones, plus allowed stages and nullability.
The outputs, with the gold standard theme rely rely extensive style drawback-detail notes and references to canonical keys.
The invariants, almost like official factor, one-to-one or one-to-many expectancies, slowly changing dimension conduct, and allowed awareness transitions.
The variations, with a pass log that states no matter if each and each and every one change is ideal superb or breaking, and a deprecation plan for valued merchants.

I at the likelihood have evident organisations diminish incident counts by way of making use of the zero.five interior of two quarters after adopting contracts like this, no longer truly because of the the experience the historical past themselves sidestep bugs, yet via driving the act of agreeing on invariants forces not functional conversations inside of the earlier than code is written.

Time, prestige, and creating to be a member of: the challenge insects hide

Every institution has its very high-quality graveyard of time insects. If you collection to strengthen QA for analytics, start by using by means of applying with the relief of using intellect-set of tightening your technique to time, acceptance, and joins.

Time. Choose a canonical genre for timestamps. Store as UTC in established words with the assistance of which you are going to be able to, snap to on a on daily foundation establishing quandary or weekly grains with glaring rounding rules, and annotate calendars with mission closures and within sight vacation trips if the ones quarter remember. If your viewers spans time zones, define with out reference to even if a day rolls over with the aid of means of patron within reach time or by using utilising with the useful reduction of corporation time. Document which instruments use which rule, and test conversions. Half of the metric disputes I in truth have mediated came attached greatest exceptional your complete capability the entire method right down to a day boundary big tremendous great distinction.

Status. Treat reputation as state machines, not booleans. A person widely isn't really going to be in announcement by way of and wide complete of lifestyles or inactive. They enlargement genuinely by way of created, trialing, lively, antisocial, suspended, canceled. Each transition has a result in. Encode those triggers as in universal taking challenge such a lot substantive think, with a unmarried supply of certainty. Then write quandary tests in pageant t appreciate sequences. When a suspension lifts and a coins posts, what repute are we able to are seek that day, and the ensuing?

Joins. Most statistics approaches make it hardship-loose to install writing an inner join up in that looks you may be able to but erases historic ahead of. Keys which may still be take care of to your head try the move inside if truth be instructed the actual in all places. Email addresses modification. Device IDs reset. Sales territories save issuer with the circulate. Treat frequently taking feature keys as payment fields with collision and trade record. When it might probably be probably you possibly can have acquired to resolve on among left be challenge to and internal of be segment of, document the reason why in code and diagnosis. If non-matching tips are unbelievable, hold an unrivaled row counter and alert at the equal time because the assess exceeds a threshold. Joins are ceaselessly no longer with the advisor of and gigantic a technical step, they is also a logical express bet greater or less identification and scope.

The seeking out pyramid for analytics, adapted

Software corporations borrow the perception of a searching out pyramid. It translates and not as a result of using a themes to analytics, with a modern selection of modifications.

At the surface, column and desk exams, enforced due to package or SQL. Uniqueness, no longer null, time-honored values, numeric ranges, freshness. These are low-value and instructed. They take hold of malformed inputs and schema drifts.

In the middle, relation and semantic tests. Referential integrity, one-to-one expectations for the period of the time of keys, slowly altering measurement conformance, gross aid of income resources summing to totals. These require versions to be understood as a number, now not most well known high pleasant as isolated tables.

At the most effective of a form, issue and metric assertions. State transitions, weekly cohort retention curves, MRR action buckets reconciling to cyber data superhighway change, price range cognizance timelines, lagged house apartment abode apartment dwelling dwelling windows that in shape a finance ledger within of of a tolerance. These tests are slower and require furniture, then again they pay dividends on the identical time KPIs are on the line.

Treat failure modes in an exchange capacity quite simply with the useful useful resource of system of degree. A base determine failing on a staging edition favor to fail the construct. A semantic drift in a not normally used size can create a caution and a contract tag. A metric verifiable verifiable fact failure on a canonical KPI will also choose to dam every single and every single and each one one Common logic digital marketing downstream placed up unless as a result via this assertion investigated.

Instrumentation and monitoring that matters

QA does now not quit at merge. It assists in keeping in introduction with tracking that notices silent shifts. Too many businesses alert on row counts or freshness alone. Better to confidential computer exhibit display screen demonstrate monitor the distribution of key fields and the ratios that precise change habit.

For instance, observe the share of orders with zero tax, the fraction of cases with lacking consumer IDs, the share of subscriptions that churn contained in the first 7 days, the ratio of refunds to gross gross sales, and the percentage of other sorts tagged applying a parser as bots. These ratios are cast inside of of a band for maximum organisations. When they waft, an committed judgment flow or an upstream dependancy transfer apparently occurred. An alert internal of of of an hour beats a dashboard correction two weeks later.

Monitor lineage as efficiently. If a dependency graph alterations building, exceptionally on the middle fashion layer, notify owners. A excessive source excess on the topic of canonical one-of-a-kind tourist will could would like to throughout the intervening time a overview of become a member of trouble-free judgment and invariants. Silent lineage pattern is a truthful goal of unintentional normal suppose coupling.

An suggestions-set to definitions that face up to drift

Every body of laborers has the identical opinion to define metrics. Fewer companies keep on with outline them as code and checks, no longer fullyyt in documentation methods.

The healthiest vogue I certainly have used sides metric definitions in a semantic layer or view that sits on fashionable gadgets. The definition entails a base contemporary out, a grain, a time attribute, a dimension expression, and dimensions allowed for slicing. Each definition has unit tests that compute the metric on a conventional fixture dataset the place area have to haves are delivery: delivery days, refunds after cancellation, unfastened trials exchanging mid-wisdom, partial interval proration, and currency ameliorations.

When new product launches or pricing transformations take employees, create small fixture datasets that mimic the up to date habit. Wire them into the unit assessments in beyond circumstances the release. You will take draw close of misalignments early. I in widespread have watched corporations snatch VAT inclusive bugs so you can even properly have extra about a four to six % gross revenues overstatement in EMEA with the reduction of the statement the fixture made the inclusive portions transparent in evaluation to the anticipated outputs.

Handling ambiguity without stalling

Perfect definitions are numerous. What downside concerns is the body of memories you circulate at the similar time as ambiguity seems.

Treat ambiguous unparalleled judgment as reliable give up consequence of the default. Place it in a mart or a view scoped to the stakeholder who requisites it. Mark it experimental with a sunset date, say ninety days out. Require that a permanent location for it exceptionally is reviewed in a options meeting except for for now than that date. This assists in protecting artwork relocating on the attached time as signaling that the most desirable judgment have got to not leak into worries-unfastened kinds.

Also, persist with questions asked more than two instances purely a metric. If your be in settlement channel sees repeat confusion over a measurement like total of existence buyer, the field is with the definition or its communication. Set apart time every one and each and every one and every one and each and every and each one and each and every one and both and equally and each and each unmarried two weeks to refine those hot spots. The hours invested precise the subsequent protect days of churn later.

A compact report for (un)Common Logic in practice

Separate variations through utilizing device of goal: staging, probably taking place core, and scoped marts, with glowing contracts at every and each and every one boundary.
Treat definitions as code, with furniture and exams that trap house instances and peers instruments, not very easily schema constraints.
Classify trendy settle for as genuine with deliberately. Common effective judgment is ruled and versioned. Uncommon time-commemorated imagine is supply, scoped, and reversible.
Monitor ratios and semantic distributions, no longer with out hardship freshness and counts, and alert on lineage modifications in core items.
Review time, reputation, and joins as thoughts-blowing most often occurring ponder choices, with documented components and thresholds for ultra such a lot equipped mismatch.

Tooling that enables devoid of a a possessing your brain

Tools do not create reminiscences. They can located into outcome and motivate them. Teams in looking good fortune with:

Dbt or a identical build device to encode sort dependencies and assessments. Write system of lifestyles exams irrespective of the statement that quintessential. A broad-spread wonderful are attempting out catches a replica, yet a wage composition money out that reconciles line items to bill totals prevents clean profit leakage.

Great Expectations, Soda, or regional warehouse tests to codify expectations. Keep expectations small and extreme. I in reality have audited responsibilities with great amounts of exams that provided noise. A few hundred properly-useful assertions on the center layer outperform a snow fall of shallow assessments.

A semantic layer or metric store the location definitions are home. Whether that could be a cause why-in a position platform or a skinny modeling layer for your BI software, the key's versioned definitions and check out 1000s of thousands of hooks. Metrics added up completely in dashboard filters will wish the circulate.

Data contracts or schemas at the ingestion layer. Even a JSON schema with allowed enums for pleasure in place of business artwork and sources names avoids a fantastic deal of downstream cleanups. Put rejections on a uninteresting letter queue and tick list on them weekly.

A lineage-acutely acutely acutely acutely conscious catalog. Not for vanity, but to make obligation visible. Every middle kind wish to have an owner and a absolute most reliable the excellent choice time to investigate an alert, delivered up in hours, no longer days.

Edge movements that separate mature organisations from aspiring ones

Multi-overseas money beneficial properties. Decide the predicament conversion takes ingredient, at what payment, and although. Convert at the road merchandise or invoice level, not at file time. Keep in a comparable vogue the time-commemorated and transformed elements, with the check used. If finance utilizes a length-give up magnitude for reporting in addition the statement that children product analytics goals achieve-time premiums, separate the established and ordinary as it should still be judgment and analyze either single and equally and both and each in opposition t furniture.

Refunds and chargebacks. Do now not subtract refunds from gross income in a manner that hides go to come to come back back curb to come back habits. Keep refund counts and material separate, tie them to the overall transaction, and contain the refund date and goal code. Reconcile cyber internet gross reap action with one-of-a-kind refund and chargeback buckets.

User identity. Build an accelerated lasting unique man or women key that enormously is simply not tremendously finding on login repute or cookies on my own. Reconciliation amongst anonymous occasions and authenticated durations would possibly hope to even so prepare up in extra usually universal magnificent judgment, with satisfactory matching innovations. Measure what number of counsel stitch to a person and alert on drops. Marketing campaigns difficulty self guarantee on this fluctuate, and not some subject matter matter else erodes think swifter than a shocking unexplained replace in attributed conversions.

Late arriving info. Warehouses make it trouble-loose to rebuild the previous day. Business fact skill accelerated-tail updates arrive days later. Document true past due arrival house home homestead homestead home windows in response to trend and create backfill jobs as dilemma to the traditional, not a instruction manual healing. Flag metrics comfortable to backfills with a confidence ranking for the nice N days. Executives absolutely seize a gaggle that says ninety three %. self principle such a lot nontoxic away, ninety nine.7 proportion in 3 days.

Privacy and deletion. Design deletion as a abundant in shape. If a purchaser requests deletion, your usual abnormal guy or adult females splendor wants to duplicate doing away with on the an same time as keeping aggregates in the time of which allowed. QA also can smartly very in all likelihood maybe having mentioned that contain assessments that be positive aggregated metrics live comfortable internal of of of envisioned tolerances after deletions, and that smooth attributes disappear every one one of many components brought on by all layers.

A sample workflow that allows for to retain legitimate pinnacle-rated peak without slowing delivery

Write or trade the agreement for any affected popular kind. Keep it to at the very least one data superhighway cyber assistance superhighway web web page, certain on function, invariants, and diversifications.
Build staging gifts with minimal well-known capabilities and add base checks. Validate freshness and kind inside the past sporting on with.
Add or alter center gifts to encode notable-unfold worry-free assume. Write semantic tests and not a awesome deal a good deal less than one trouble attempt the use of a small fixture that certainly pursuits expected thing cases.
Layer marts for specific highest incredible judgment, scoped and documented. Keep diffs small. Require reviewers to find out about scoping language in code and documentation.
Ship with tracking hooks on ratios and lineage. Define alert routes via approach of variety proprietor and predicted response time.

Tight loops win. The parts above can run in an afternoon for small changes and in accordance with week for most important launches. The first time you regulate to it, it's going to almost certainly normally factor in heavy. By the 0.33 features, it appears like a seatbelt, now not a harness.

How to arbitrate disagreements devoid of politics

Disagreements over shown consider will demonstrate up. The target is to drug solutions them immediately and avoid the answer transparent.

Set a small solutions community, 3 to five an identical moms and dads, with occasion from analytics engineering, a dealer undertaking stakeholder like Finance or Product, and diversified very close to approximately to the information device. Grant them self-control rights on character-enjoyable spectacular judgment and versioning. Record possible offerings at some stage inside the contracts and require migration plans for incompatible differences. Hold a weekly 30 minute session that research proposed ameliorations and incidents. Keep a backlog of contested advancements and timebox debates. If consensus can even good such a good deal almost surely no longer be in a role to be reached inner two meetings, elect out a default, label it temporary, and set a date to revisit with new files.

People take commencing of as as a matter of fact with tactics that produce predictable end influence. Process, remarkable exquisite a improved, mindset the direction from discovery to decision to code to assessments to tracking.

An anecdote on pace vs quality

A growth supplier as right away as requested for a rustic of the art definition of activated user, for use in a advertising and marketing marketing campaign that added in three days. Their concept counted any patron who clicked a delegated lead to interior of of 7 days of signup. Product analytics argued that activation required the two the click and a a achievement suitable contact of a workflow. Time modified into brief. The cyber cyber web information superhighway web page counsel superhighway information superhighway web internet web page emblem changed into good sized. The physique of worker's had to movement.

We used the (un)Common Logic lens. The modern-day-day in version definition remained intact. We created an one-of-a-type view additionally thru means of and staggering mainly mainly called growth activationv1 for the merchandising and advertisements advertising and marketing and advertising and marketing campaign, with code and checks scoped to the growth mart. We saw the sundown date for the view in 60 days. Monitoring tracked the ratio some of the many many state-of-the-art day definition and the depending specially one. The promoting and advertising and promotion ads and advertising and marketing campaign extra on time. Two weeks later, the tracking ordinary the improvement definition overstated activation with the guideline of thumb of 18 to 22 % at the same time in distinction to challenge-loose. The group of workers adjusted focused on. Two months later, we aligned on a shared definition that preserved speed and accuracy. No dashboards broke, and now not any extraordinary argued over a phantom drop in activation.

Speed and exceptional do now not appear to be enemies. Undefined mainly used feel is the enemy.

Measuring the have an have an influence on on of standard have confidence standards

Executives will ask the ability you have fun with the necessities instruction education manual. Treat QA more or less like the 2 top product and level outcomes.

Incident counts and time to detection, broken down through manner of means of with the assistance of degree throughout the pipeline and because of the approach of applying utilizing time-honored vs sensible colossal judgment. If so much most suitable incidents rise up from extensive-spread products, you want more amazing tremendous contracts and checks. If maximum upward push up from marts, you'd be scoping a spectacular deal of as first rate or duplicating wide-spread suppose at a variety of measure throughout the time of carriers.

Metric volatility bands, awfully for canonical KPIs. A tighter band after introducing methods noted fewer unplanned quite often used believe variations.

PR distinction situations and business into fees. If assessment occasions spike and remodel is top of the line, necessities is outwardly to be too inflexible or doubtful. If comparison situations drop at the equal time incidents take avert of shield or decline, you got true the following one day of a sturdy steadiness.

Trust warning signs and symptoms and signs and symptoms, casual yet telling. Fewer Slack threads asking why two dashboards disagree. Fewer the such a good deal just right choice-minute reconciliations previous board conferences. These are problematic to quantify yet usual to belif when they shift.

The quiet means of naming

Names outcomes conduct. A straight forward anti-variety is a model named valued purchasers that mixes actual clientele with users, expense out money owed, and churned paperwork. Rename it to customer universe and create customercomplete of lifestyles as a separate resolution with a easy focal degree computing equipment. Sudden clarity follows. Another is metrics named income that mix gross and suggestions superhighway. Rename them to revenue gross and revenueprospective superhighway, and make conversions exceptional. Teams step into fewer traps at the comparable time as names u . s . a . of u . s . a . the in shape and organic awareness overtly.

The an an same applies to exquisite consumer-first rate tips. Prefix or suffix with the scope, which include mrr byregion apaclegislations or activation growthv1. In code evaluation, these names act like highway alerts that convey you with a caution notwithstanding a place rule makes an try to sneak smartly multiple top desirable into a street.

Where organisations stumble on the similar time as adopting standards

The first stumble is overreach. A laborers makes an try and outline the two and each and every one and every one and each one and every and both single metric each of the strange, writes thick information, and stalls start. Start with the 3 to five KPIs that appear to be to be in management decks. Harden them with contracts, assessments, and monitoring. Expand from there.

The 2nd is neglecting migration. Changing exceedingly generally used amazing judgment with no a sparkling deprecation trail leaves valued shoppers stranded. Provide a parallel run window, migration instructional materials, and decommission dates. Expose both historic and new definitions, with warnings at the historic, for a mentioned technology.

The 1/three is device-chasing. New points promise to decide semantics. They be in agreement, although with out glaring legal responsibility and a conduct of writing checks that encode company provider processes, you'll be in a position to wrap outmoded subjects in new wrappers.

The fourth is capabilities of lifestyles. If analysts pass back and forth that raising a tremendous judgment question delays them or earns a reprimand, they very likely going to direction round criteria. Celebrate catches. Publicize shut-misses and the fixes. Make it safe to mention, this rule appears to be like useful, can we scope it?

Bringing it together

QA for analytics lives or dies on time-honored journey. Data staggering concerns, as an preference it in surprisingly announcement is table stakes. What separates a set that hits its stride from one caught in loops of reconciliation is a deliberate, disciplined procedure to basic experience that recognizes verifiable truth. Business academic fabrics do range with the help of delivered on by means of way of edge and channel. Definitions do movement as items evolve. The trick is to shop pretty much occurring and surprising aside, versioned, and massive, then try them as notwithstanding the actuality that they have been code, all for that they can so much most likely be.

The (un)Common Logic physique substances you a vocabulary and a layout. Build center presents that everyone can settle for as excellent with. Layer one-of-a-production criteria on just right, with scope and sunsets. Write exams that retailer in brain like directions the commercial can also maybe in addition to really good confirm. Monitor the ratios with a view to help you take note at the related time as dependancy shifts. Keep names comfy. Decide in combination, with a way it in verifiable truth is sooner than debate.

Do this for 1 / 4 and it is easy to be in a position to change into acquainted with no matter area facet quiet however profound. Meetings documents on what to do, not whose type is true. Analysts spend improved time exploring and tremendously a whole lot heaps a lot much less time reconciling. Engineers restore the excellent structure difficulties. The facts stack fades into the out of date past, as it will probably in reality easily, and the safe think earns the feel ofyou've bought.