KPI You glossary

Plain-English definitions for the words that come up when you set personal goals, build habits and track your own numbers, from time and money to sleep and learning. Each entry is short and points to related terms, so you can follow an idea from a goal to the habit that supports it to the metric that shows whether it's working. Health-related entries are general information, not medical advice.

Accountability partner: A person you agree to check in with about your goals, such as a friend you text each week with your progress. Knowing someone will ask can make it easier to follow through, and they can help you adjust a plan that isn't working.; Related:Commitment device Weekly review Habit tracker
Automaticity: The degree to which a behavior happens with little thought or effort, prompted by its cue. Habit researchers often treat increasing automaticity as the sign that a habit is forming.; Related:Habit Habit formation period Self-Report Habit Index (SRHI)
Baseline: Your starting measurement before you change anything, such as your average nightly sleep or monthly spending over the last few weeks. Without a baseline, it's hard to tell whether a new habit is actually making a difference.; Related:Personal KPI Moving average Time audit
Body mass index (BMI): Weight in kilograms divided by the square of height in meters. The CDC calls it a quick, low-cost screening measure, but it does not directly measure body fat, and for individuals it should be considered alongside other factors with a healthcare provider.; Related:Baseline Lagging indicator Goodhart's law
Commitment device: An arrangement you set up in advance that makes it easier to follow through on a goal, or harder to back out, such as automatic savings transfers or keeping a favorite audiobook only for workouts. It works by deciding once, while motivation is high, instead of every day.; Related:Temptation bundling Pay yourself first Accountability partner
Compound interest: Interest paid on the original amount (the principal) and on interest already earned, so growth builds on itself over time. It is why small, regular savings can add up over long periods, and why high-interest debt can grow quickly.; Related:Pay yourself first Net worth Savings rate
Context-dependent repetition: Repeating a behavior in the same situation, such as the same place or after the same daily event, so the situation becomes linked to the action. Habit researchers report that repeating a simple action in a consistent context links the action to those cues through associative learning, until the cues alone start it.; Related:Habit Cue Automaticity
Credit score: According to the CFPB, "a prediction of your credit behavior, such as how likely you are to pay a loan back on time, based on information from your credit reports." Lenders, landlords and others use it in deciding whether to offer credit or housing.; Related:Debt-to-income ratio (DTI)Net worth Lagging indicator
Cue: The trigger that starts a habit, such as a time of day, a place, a preceding action or a feeling. Picking a clear, reliable cue, like "after I pour my morning coffee," is one of the simplest ways to make a new behavior stick.; Related:Habit Habit stacking Implementation intention
Debt-to-income ratio (DTI): All your monthly debt payments divided by your gross monthly income, as the CFPB defines it. Lenders use it to judge your ability to manage new payments, and tracking it over time shows whether debt is shrinking relative to income.; Related:Net worth Credit score Lagging indicator
Deliberate practice: Structured practice aimed at improving specific parts of a skill, with a well-defined task and clear goal, immediate informative feedback, and repeated attempts, often designed by a teacher. The concept comes from K. Anders Ericsson, Ralf Krampe and Clemens Tesch-Römer's 1993 research on expert performance.; Related:Retrieval practice Spaced repetition Process goal
Emergency fund: The Consumer Financial Protection Bureau defines it as "a cash reserve that's specifically set aside for unplanned expenses or financial emergencies," such as car repairs, medical bills or a loss of income. Months of expenses covered is a common personal finance KPI.; Related:Pay yourself first Savings rate Milestone
Fogg Behavior Model (B=MAP): A model from behavior scientist BJ Fogg, which his official site summarizes as "Behavior happens when Motivation, Ability, and a Prompt come together at the same time." When a habit isn't happening, it suggests checking all three, not just motivation.; Related:Tiny habits Cue Friction
Fresh start effect: The tendency to take on aspirational goals right after a temporal landmark, such as the start of a new week, month or year, a birthday or a holiday. Hengchen Dai, Katherine Milkman and Jason Riis described it in a 2014 paper that found diet-related searches, gym visits and goal commitments all rose after such dates.; Related:Commitment device Weekly review Outcome goal
Friction: Anything that adds effort or steps between you and a behavior. Reducing friction for habits you want (laying out workout clothes the night before) and adding it for habits you don't (moving a distracting app off your home screen) is a common way to shape your environment.; Related:Fogg Behavior Model (B=MAP)Tiny habits Temptation bundling
Goal-setting theory: A long-running line of research, summarized by psychologists Edwin Locke and Gary Latham, on how goals affect performance, especially the effectiveness of specific, difficult goals, and on what strengthens or weakens that effect, such as self-efficacy. It is the research background behind much everyday goal advice.; Related:SMART goal Outcome goal Implementation intention
Goodhart's law: The principle, named for British economist Charles Goodhart, that "any observed statistical regularity will tend to collapse once pressure is placed upon it for control purposes," as he put it in 1975. Its best-known wording, "when a measure becomes a target, it ceases to be a good measure," is a later paraphrase coined by anthropologist Marilyn Strathern. In personal tracking, it's a reminder that chasing a number (steps, streaks, pages read) can crowd out the real goal the number was meant to reflect.; Related:Vanity metric Personal KPI Streak
Habit: In psychology, habits are defined as "actions that are triggered automatically in response to contextual cues that have been associated with their performance" (Gardner, Lally and Wardle, 2012). In everyday speech, the word often just means something you do regularly.; Related:Cue Automaticity Context-dependent repetition
Habit formation period: How long it takes a repeated behavior to become automatic. In a 2010 study by Phillippa Lally and colleagues, the time participants took to reach 95% of their automaticity plateau ranged from 18 to 254 days, with a median of 66 days, so there is no single magic number.; Related:Automaticity Streak Lapse
Habit stacking: Attaching a new habit to one you already do reliably, so the existing habit becomes the cue: "After I brush my teeth, I will floss one tooth." It is a practical way to apply the if-then structure of an implementation intention.; Related:Cue Implementation intention Tiny habits
Habit tracker: A simple record, such as a paper grid, calendar or spreadsheet, where you mark each day you complete a habit. It turns intentions into visible data and makes patterns, like which days you tend to skip, easy to spot.; Related:Streak Weekly review Quantified self
Implementation intention: A specific if-then plan that links a situation to an action, in the form "When situation x arises, I will perform response y." Psychologist Peter Gollwitzer described it as specifying the when, where and how of acting on a goal, as opposed to a goal intention, which states only the end point.; Related:WOOP Cue Habit stacking
Lagging indicator: A metric that records a result after the fact, such as net worth at year-end or a race finish time. It tells you whether you got where you wanted, but it reacts slowly, so pair it with leading indicators.; Related:Leading indicator Outcome goal Personal KPI
Lapse: A single slip from a habit or plan, such as skipping one workout or one day of budgeting. Treating a lapse as a one-off and getting back on track at the next opportunity matters more than a perfect record.; Related:Streak Fresh start effect Habit formation period
Leading indicator: A metric that moves before the result you care about and that you can influence directly, such as workouts completed per week or dollars saved per paycheck. Tracking leading indicators gives you early feedback while there is still time to adjust.; Related:Lagging indicator Process goal Personal KPI
Milestone: A checkpoint on the way to a bigger goal, such as saving the first $500 of an emergency fund. Milestones break a long goal into stages you can see and celebrate, and they show early whether your pace is realistic.; Related:Outcome goal Objectives and key results (OKR)Planning fallacy
Moderate-intensity physical activity: Activity that raises your effort noticeably, such as brisk walking. The CDC, citing the Physical Activity Guidelines for Americans, says adults need at least 150 minutes of moderate-intensity activity a week, plus muscle-strengthening activity on at least 2 days.; Related:Resting heart rate Process goal Leading indicator
Mood tracking: Regularly noting how you feel, often on a simple scale with a short note, to notice patterns, such as how sleep or exercise lines up with your mood. It is a self-awareness tool, not a diagnosis or a substitute for professional care; in the US, if you are in crisis, call or text 988.; Related:Quantified self Habit tracker Sleep duration
Moving average: An average recalculated over a sliding window, such as your average sleep over the last seven days, updated each day. It smooths out daily noise so you can see the underlying trend in a personal metric.; Related:Baseline Sleep duration Personal KPI
Net worth: What you own (assets) minus what you owe (liabilities). The SEC's investor education guide suggests writing a net worth statement and updating it every year to see how you are doing, and notes that a negative starting number is no reason to be discouraged.; Related:Lagging indicator Savings rate Debt-to-income ratio (DTI)
Objectives and key results (OKR): A goal framework that pairs a qualitative objective (what you want to achieve) with a few measurable key results (how you will know you got there). It started in business, but people use it at home too, for example an objective of "build a reading habit" with key results like "finish six books this year."; Related:Personal KPI SMART goal Milestone
Outcome goal: A goal defined by the end result you want, such as paying off a credit card or running a 10K. Outcomes are motivating, but they often depend partly on things you don't control, so they work best paired with process goals.; Related:Process goal Lagging indicator SMART goal
Pay yourself first: Treating savings as the first "bill" you pay each month rather than saving whatever is left over. The SEC's investor education guide notes many people find this easier with an automatic transfer from their paycheck to a savings or investment account.; Related:Savings rate Emergency fund Commitment device
Personal KPI: A key performance indicator you choose for your own life: one number that shows whether you are moving toward something you care about, such as hours of focused work per week or months of expenses saved. A good personal KPI is tied to a specific goal and is easy to measure the same way every time.; Related:Leading indicator Lagging indicator Baseline
Planning fallacy: The common tendency to underestimate how long a task or project will take, even when similar tasks have run late before. Building in buffer time and checking how long things actually took last time are simple ways to plan around it.; Related:Milestone Time audit Weekly review
Pomodoro Technique: A time-management method created by Francesco Cirillo, which he began developing as a university student in the 1980s using a tomato-shaped kitchen timer. It centers on working on one activity at a time in timed intervals with regular breaks, and on recording effort to compare estimates with reality.; Related:Time blocking Time audit Planning fallacy
Process goal: A goal defined by the actions you will take rather than the result, such as "practice Spanish 15 minutes a day" or "cook dinner at home five nights a week." Process goals are fully within your control and are easier to turn into habits.; Related:Outcome goal Leading indicator Habit
Quantified self: The practice of self-tracking, collecting data about your own behavior, body, time or surroundings, to answer personal questions. The community that uses the name also calls this "personal science."; Related:Habit tracker Baseline Time audit
Resting heart rate: How many times your heart beats per minute while you are at rest. The American Heart Association says a normal resting heart rate is between 60 and 100 beats per minute when you are sitting or lying, calm and feeling well. It also notes that a rate below 60 doesn't always signal a medical problem and is common in athletes, so ask a clinician about readings that concern you rather than diagnosing yourself.; Related:Moderate-intensity physical activity Baseline Quantified self
Retrieval practice: Learning by pulling information out of memory, such as quizzing yourself or using flashcards, rather than rereading. In a 2006 study, Henry Roediger and Jeffrey Karpicke found that practice tests produced better retention on delayed tests than restudying did.; Related:Spaced repetition Deliberate practice Leading indicator
Savings rate: The share of your income you save over a period, commonly calculated as the amount saved divided by income for that period. Because it is under your control month to month, it works well as a leading indicator for long-term money goals.; Related:Leading indicator Pay yourself first Net worth
Self-Report Habit Index (SRHI): A questionnaire researchers use to measure habit strength by asking people how automatic a behavior feels to them. Habit-formation studies, including Lally and colleagues' 2010 study, have used items from it to track automaticity over time.; Related:Automaticity Habit formation period Habit
Sleep duration: How long you sleep in a 24-hour period. The CDC lists 7 or more hours for adults 18 to 60, 7 to 9 hours for ages 61 to 64, and 7 to 8 hours for adults 65 and older; talk with a healthcare professional about ongoing sleep problems.; Related:Moving average Baseline Quantified self
SMART goal: A goal written to be Specific, Measurable, Achievable, Relevant and Time-bound, the most common reading of the acronym (some versions swap in words like "ambitious" or "realistic"). For example, "walk 20 minutes after lunch on weekdays through December" is SMART; "get healthier" is not.; Related:Outcome goal Process goal Milestone
Spaced repetition: Reviewing material in sessions spread out over time instead of cramming it all at once; researchers call it distributed practice. A 2013 review by John Dunlosky and colleagues rated distributed practice, along with practice testing, as high-utility learning techniques.; Related:Retrieval practice Deliberate practice Habit tracker
Streak: The number of consecutive days (or other periods) you have completed a habit. Streaks can be motivating, but one missed day doesn't erase progress: in Lally and colleagues' 2010 study, missing one opportunity did not materially affect habit formation.; Related:Habit tracker Lapse Habit formation period
Temptation bundling: Pairing something you want to do with something you should do, and only allowing the treat during the chore, such as listening to a page-turner audiobook only while exercising. Katherine Milkman, Julia Minson and Kevin Volpp tested the idea in a 2014 field experiment at a gym.; Related:Commitment device Friction Habit
Time audit: Recording how you actually spend your time, often in 15- or 30-minute blocks for a week, then comparing it with how you think you spend it or want to. It is a common first step before setting time-related goals.; Related:Baseline Time blocking Planning fallacy
Time blocking: Scheduling specific blocks on your calendar for specific tasks or habits, such as 7:00 to 7:30 a.m. for exercise, instead of working from a to-do list alone. It makes time a visible, limited resource and gives habits a fixed slot.; Related:Pomodoro Technique Time audit Cue
Tiny habits: Deliberately small versions of a behavior, such as one push-up or one line in a journal, chosen so they are easy to do even on a bad day. The term is closely tied to behavior scientist BJ Fogg, author of the book Tiny Habits.; Related:Fogg Behavior Model (B=MAP)Habit stacking Friction
Vanity metric: A number that looks impressive or feels good but doesn't help you make decisions, such as total app sessions logged. A useful personal metric is one where a change would actually change what you do next.; Related:Goodhart's law Personal KPI Leading indicator
Weekly review: A regular, scheduled look back at the past week and ahead to the next: what got done, what slipped, and what to change. The Getting Things Done (GTD) method includes a formal weekly review, and the same idea works for checking habit trackers and personal metrics.; Related:Habit tracker Personal KPI Planning fallacy
WOOP: A goal strategy whose letters stand for Wish, Outcome, Obstacle, Plan: you name a wish, picture the best outcome, identify the inner obstacle most likely to get in the way, and make an if-then plan for it. It grows out of motivation research by psychologist Gabriele Oettingen.; Related:Implementation intention Outcome goal Planning fallacy