# MRP Nervousness Assessment: How Unstable Is Your Material Plan? > Source: https://netray.co/tools/mrp-nervousness-assessment > Publisher: Netray (netray.co), AI and integration engineering for ERP and manufacturing systems. > Section: Free Tools ## Short answer A 10-question diagnostic that scores how badly your MRP plan churns between runs - and pinpoints which levers will stabilize it. ## Category manufacturing ## Tool **Kind:** assessment **Questions:** #### How often do MRP action messages reverse themselves (expedite one run, de-expedite the next) on the same orders? **Help:** Reversal churn is the classic symptom of nervousness - the plan oscillates without any real demand change. **Options:** ##### Constantly - planners joke about it **Score:** 0 ##### Weekly on many items **Score:** 1 ##### Occasionally, on a known set of items **Score:** 2 ##### Rarely - messages are stable between runs **Score:** 3 #### Do you use planning time fences or firm zones to protect the near-term schedule? **Options:** ##### No fences - MRP replans everything every run **Score:** 0 ##### Fences exist in the ERP but are routinely overridden **Score:** 1 ##### Fences on key items, inconsistently maintained **Score:** 2 ##### Fences on all planned items, reviewed and enforced **Score:** 3 #### How is your master production schedule managed inside the frozen or firm period? **Options:** ##### There is no frozen period - anything can change any day **Score:** 0 ##### A frozen period exists on paper but sales overrides it weekly **Score:** 1 ##### Changes inside the fence need approval and are uncommon **Score:** 2 ##### Disciplined frozen/slushy/liquid zones with tracked exceptions **Score:** 3 #### What lot-sizing rules dominate your item master? **Help:** Lot-for-lot on lumpy demand and large fixed quantities both amplify nervousness up the BOM. **Options:** ##### Whatever was set at go-live - nobody has reviewed them **Score:** 0 ##### Mostly lot-for-lot everywhere, including lumpy items **Score:** 1 ##### Mixed policies, reviewed when problems appear **Score:** 2 ##### Policies chosen by segment (ABC/XYZ) and reviewed periodically **Score:** 3 #### How accurate are the lead times in your item master? **Options:** ##### Largely fictional - set years ago **Score:** 0 ##### Known to be wrong on many items, fixed ad hoc **Score:** 1 ##### Mostly realistic, updated after major misses **Score:** 2 ##### Regularly reconciled against actual receipt history **Score:** 3 #### How do you buffer against demand and supply variability? **Help:** Safety stock absorbs variability quietly; blanket safety lead time shifts timing and tends to amplify replan churn. **Options:** ##### No deliberate buffers - or hidden buffers planners keep in their heads **Score:** 0 ##### Blanket safety lead time added to most items **Score:** 1 ##### Static safety stocks set once, rarely revisited **Score:** 2 ##### Sized safety stocks by variability class, recalculated periodically **Score:** 3 #### How volatile is the demand signal feeding MRP? **Options:** ##### Forecast changes flow straight into MRP daily, unfiltered **Score:** 0 ##### Frequent large forecast swings with no consumption logic **Score:** 1 ##### Forecast consumption works; occasional large swings **Score:** 2 ##### Stable, consumed forecast with managed abnormal demand **Score:** 3 #### What is the exception (action) message volume after a typical MRP run? **Options:** ##### Thousands - planners have stopped reading them **Score:** 0 ##### Hundreds per planner; only fires get attention **Score:** 1 ##### Manageable with filtering and prioritization **Score:** 2 ##### Low and actionable - most messages get worked same day **Score:** 3 #### How much do planners override MRP with manual orders and off-system spreadsheets? **Options:** ##### The real plan lives in spreadsheets; MRP is background noise **Score:** 0 ##### Heavy manual overriding on most important items **Score:** 1 ##### Occasional overrides, usually documented **Score:** 2 ##### Planners work through the system; overrides are rare and reviewed **Score:** 3 #### How accurate are inventory records and BOMs feeding the MRP run? **Help:** Bad on-hand balances and BOMs make every net requirement wrong, forcing constant correction cycles. **Options:** ##### Inventory accuracy below 90%; BOM errors surface weekly **Score:** 0 ##### Around 90-95% accuracy; BOM issues on new products **Score:** 1 ##### 95-98% accuracy with cycle counting in place **Score:** 2 ##### 98%+ accuracy, disciplined cycle counts, controlled BOM changes **Score:** 3 **Bands:** #### Severely Nervous **Min:** 0 **Max:** 24 **Verdict:** Your MRP output changes so much between runs that the shop and suppliers have rationally stopped trusting it. The formal plan and the real plan are two different things, and expediting is your actual scheduling system. **Recommendations:** - Declare a two-week firm zone on the master schedule immediately and route every inside-the-fence change through one approver. - Fix inventory record accuracy first - start cycle counting A items daily; nothing else stabilizes until on-hand balances are trusted. - Reduce full MRP regeneration frequency (for example, weekly regen with daily net change) until the causes of churn are addressed. - Pick the 20 most-expedited items and correct their lead times and lot sizes against actual history this month. - Stop adding safety lead time as a coping mechanism - it compounds the churn you are trying to escape. #### Unstable **Min:** 25 **Max:** 49 **Verdict:** MRP produces a usable plan but churns enough that planners hedge with manual overrides and informal buffers. The instability is costing you in expediting, excess inventory, and supplier trust, and it usually traces to a handful of parameter and discipline gaps. **Recommendations:** - Implement planning time fences on all planned items and audit fence overrides weekly. - Run a lot-sizing review by segment: period order quantities for lumpy B/C items, tighter dynamic policies for A items. - Reconcile lead times for your top 200 items against actual receipt and production history. - Add forecast consumption logic so incremental orders stop double-counting demand. - Set an exception message reduction target (for example, 50% in 90 days) and treat message volume as a KPI. #### Managed **Min:** 50 **Max:** 74 **Verdict:** You have the core stabilizers - fences, reasonable data, working buffers - and nervousness is contained rather than eliminated. The remaining churn likely concentrates in specific item segments, shared components, or demand-side volatility that parameter tuning alone will not fix. **Recommendations:** - Instrument nervousness itself: track plan-change counts per item between runs and Pareto the worst offenders. - Move buffer strategy from static safety stock to variability-sized buffers recalculated monthly or quarterly. - Tighten collaboration with the 5-10 suppliers most affected by reschedule messages - share schedules and agree on flex fences. - Review shared components used under multiple parents; lot sizing there transmits nervousness across product lines. - Pilot improved forecast consumption or demand sensing on your most volatile product family. #### Stable and Trusted **Min:** 75 **Max:** 100 **Verdict:** Your plan holds its shape between runs, planners work through the system, and exception messages are actionable. At this level the opportunity shifts from stabilization to responsiveness - reacting faster to real change without reintroducing churn. **Recommendations:** - Shorten frozen zones carefully where supplier flexibility allows - stability discipline now buys you agility. - Automate the routine 80% of exception message handling so planners focus on genuine judgment calls. - Use AI-assisted parameter maintenance to keep lead times, lot sizes, and buffers current as conditions drift. - Extend the stability discipline into finite-capacity scheduling so the material plan and shop schedule stop fighting. - Benchmark planner-to-item-count ratios and reinvest freed capacity into supplier development. ## Content **Intro:** This free MRP nervousness assessment scores how unstable your material requirements plan is, built for materials managers, master schedulers, and supply chain leaders running Infor SyteLine, LN, Baan, or any MRP-driven ERP. Ten questions cover the known drivers of plan churn: time fences, master schedule discipline, lot sizing, lead time accuracy, buffering strategy, demand volatility, exception volume, planner behavior, and data accuracy. You get a stability score from 0-100 with a band verdict and specific stabilization moves. If your planners trust spreadsheets more than the MRP run, start here to find out why. **Sections:** #### What MRP nervousness is and why it compounds **Body:** Nervousness is instability in planned orders between MRP runs: small changes in demand, supply, or parameters trigger disproportionate replanning, and the same order gets expedited, de-expedited, and moved repeatedly without any fundamental change in requirements. It compounds through the BOM - a modest schedule shift at the parent, amplified by lot-sizing rules, becomes violent order churn three levels down. The organizational damage is worse than the mathematical one: once planners and suppliers learn the plan will be different next week, they rationally stop acting on it, pad their own buffers, and run the real business on spreadsheets and phone calls. At that point MRP is generating paperwork, not a plan. #### How the scoring works **Body:** Each of the ten questions targets a distinct, well-documented driver of plan instability, scored 0-3 from worst practice to best. Your total is expressed as a percentage of the 30-point maximum and mapped to one of four stability bands. **Bullets:** - Questions 1-3 measure symptoms and schedule discipline: message reversal churn, time fences, and frozen-zone enforcement. - Questions 4-6 cover the parameter engine: lot sizing, lead time accuracy, and buffering strategy - the levers that amplify or dampen change. - Questions 7-8 measure signal quality: demand volatility entering MRP and the exception volume it emits. - Questions 9-10 capture trust and foundations: planner override behavior and inventory/BOM accuracy. #### Interpreting your band honestly **Body:** Scores below 50 mean stabilization comes before optimization - do not buy planning software or launch an AI forecasting project on top of a nervous plan, because better forecasts fed into an unstable engine still produce an unstable schedule. The sequencing that works in practice: data accuracy first (inventory and BOMs), then schedule discipline (fences and a defended frozen zone), then parameter hygiene (lead times, lot sizes, buffers), then demand-side smoothing. Most shops in the 25-49 band can reach the 50-74 band in one to two quarters with parameter and fence work alone, since it requires configuration changes and management discipline rather than new technology. The 75+ band is where advanced scheduling and automation investments pay off rather than amplify noise. #### How Netray helps you stabilize MRP **Body:** Netray has spent two decades inside SyteLine, LN, and Baan planning engines. A stabilization engagement starts with a quantified nervousness baseline - we measure actual planned-order churn between runs from your own MRP output rather than relying on impressions. We then correct the parameter layer (fences, lot sizes, lead times, buffers) with before-and-after simulation so you can see the inventory and churn impact before committing, and deploy on-prem AI that keeps parameters reconciled to demonstrated history so stability persists. For A&D and electronics manufacturers, everything runs inside your firewall. Typical results: 40-60% exception message reduction within two quarters. **Cta:** Get a quantified MRP churn baseline from Netray and see exactly which parameters are shaking your plan apart. **Faq:** #### What is the single fastest way to reduce MRP nervousness? **Answer:** Implement and defend a planning time fence. A firm zone of one to two weeks - inside which MRP cannot automatically reschedule and changes require human approval - immediately stops the highest-frequency churn from reaching the shop and suppliers. It costs nothing but discipline. The trade-off is slightly slower reaction to genuine near-term change, which is why the fence should be as short as your supplier and production flexibility allows, but no shorter. #### Does more frequent MRP regeneration make nervousness better or worse? **Answer:** Usually worse, if the underlying causes are unaddressed. Daily full regeneration on top of volatile inputs just delivers the churn faster. The stable pattern is frequent net-change runs for genuine events combined with disciplined inputs - fences, consumed forecasts, accurate data. Once inputs are stable, run frequency becomes a responsiveness choice rather than a nervousness driver, and daily runs are fine. #### Is safety stock or safety lead time better for damping nervousness? **Answer:** Safety stock, in most cases. It absorbs quantity variability quietly without shifting order timing, so the plan stays stable. Safety lead time moves every requirement earlier and interacts badly with lot sizing and fences, frequently amplifying reschedule churn - it belongs only where timing variability, not quantity, is genuinely the dominant problem, such as erratic supplier transit times. Blanket safety lead time across the item master is one of the most common self-inflicted nervousness wounds. ## Search terms MRP nervousness, MRP instability causes, planning time fence MRP, MRP exception messages overload, stabilize MRP schedule, MRP action message churn, master schedule freeze period --- Talk to an engineer: https://netray.co/contact?intent=erp_ai | Machine catalog: https://netray.co/agent/catalog.json