diff --git a/index.html b/index.html
index 5f52b57..3f8b71a 100644
--- a/index.html
+++ b/index.html
@@ -42,6 +42,8 @@
       </section>
 
       <section class="results">
+        <h2>엑셀 시트 인식 결과</h2>
+        <ul id="sheets" class="issues"></ul>
         <h2>계산 결과</h2>
         <table id="summary"><tbody></tbody></table>
         <h2>알림</h2>
diff --git a/src/core/geometry.ts b/src/core/geometry.ts
index 671f952..012c203 100644
--- a/src/core/geometry.ts
+++ b/src/core/geometry.ts
@@ -118,6 +118,7 @@ export interface PierModel {
     columnHeight: number;
     soilCover: number;
     pileCount: number;
+    pileLayout: string | null;
     pileTipEl: number | null;
     blockHeightFront: number;
     blockHeightBack: number;
@@ -290,6 +291,7 @@ export function buildPier(input: PierInput): PierModel {
       columnHeight: levelBottom - columns[0].bottom,
       soilCover: input.groundEl - (input.foundationType === '현장타설말뚝' ? input.footingBottomEl : footingTop),
       pileCount: piles.length,
+      pileLayout: input.foundationType === '말뚝기초' ? pileLayoutText() : null,
       pileTipEl: piles.length ? pileTip : null,
       blockHeightFront,
       blockHeightBack,
@@ -313,12 +315,26 @@ function segmentTop(segments: Segment[], s: number): number {
  * Piles under one footing (spec §4.6): rows across the footing width, piles along the length,
  * both with an end distance of 0.7 m and an even spacing that never exceeds 2.25 m.
  */
-export function pilesFor(s: number, topEl: number, length: number): PileModel[] {
+export function pileGrid(): { countS: number; countN: number; spacingS: number; spacingN: number } {
   const span = (size: number) => Math.floor((size - 2 * DIM.pileEnd) / DIM.pileSpacing) + 1;
   const countS = span(DIM.footingL);
   const countN = span(DIM.footingW);
-  const spacingS = (DIM.footingL - 2 * DIM.pileEnd) / (countS - 1);
-  const spacingN = (DIM.footingW - 2 * DIM.pileEnd) / (countN - 1);
+  return {
+    countS,
+    countN,
+    spacingS: (DIM.footingL - 2 * DIM.pileEnd) / (countS - 1),
+    spacingN: (DIM.footingW - 2 * DIM.pileEnd) / (countN - 1),
+  };
+}
+
+/** Display string such as "4@2250 × 3@2250 = 20본" (gaps along the length × gaps across the width). */
+export function pileLayoutText(): string {
+  const g = pileGrid();
+  return `${g.countS - 1}@${Math.round(g.spacingS * 1000)} × ${g.countN - 1}@${Math.round(g.spacingN * 1000)} = ${g.countS * g.countN}본`;
+}
+
+export function pilesFor(s: number, topEl: number, length: number): PileModel[] {
+  const { countS, countN, spacingS, spacingN } = pileGrid();
   const out: PileModel[] = [];
   for (let i = 0; i < countS; i++) {
     for (let j = 0; j < countN; j++) {
diff --git a/src/core/parseWorkbook.ts b/src/core/parseWorkbook.ts
index 51c08aa..38d3b1f 100644
--- a/src/core/parseWorkbook.ts
+++ b/src/core/parseWorkbook.ts
@@ -5,24 +5,50 @@ import type { Bearing, FoundationType, Issue, IpPoint, PierInput, PierType, Row
 type Cell = string | number | null | undefined;
 type Grid = Cell[][];
 
+export interface SheetReport {
+  name: string;
+  /** Pier input tables found (교각 정보 표 개수). */
+  tables: { pier: number; ip: number; bearing: number };
+  piers: number;
+  issues: Issue[];
+  /** A sheet with any E-level issue cannot be selected (spec §2.3). */
+  ok: boolean;
+}
+
 export interface ParseResult {
   piers: PierInput[];
   issues: Issue[];
+  sheets: SheetReport[];
 }
 
 const PIER_TYPES: PierType[] = ['T형', '2주형', '3주형'];
 const FOUNDATION_TYPES: FoundationType[] = ['말뚝기초', '직접기초', '현장타설말뚝'];
 
-/** Reads every sheet and collects the pier tables found by their header strings (position-independent). */
+/** Reads every sheet, finds the pier tables by their header strings, and reports each sheet separately. */
 export function parseWorkbook(wb: XLSX.WorkBook): ParseResult {
   const piers: PierInput[] = [];
   const issues: Issue[] = [];
+  const sheets: SheetReport[] = [];
   for (const sheetName of wb.SheetNames) {
     const ws = wb.Sheets[sheetName];
     const grid = XLSX.utils.sheet_to_json<Cell[]>(ws, { header: 1, raw: true, defval: null }) as Grid;
-    piers.push(...parseSheet(grid, sheetName, issues));
+    const sheetIssues: Issue[] = [];
+    const found = parseSheet(grid, sheetName, sheetIssues);
+    piers.push(...found);
+    issues.push(...sheetIssues);
+    sheets.push({
+      name: sheetName,
+      tables: {
+        pier: findHeaders(grid, (r) => r[0] === '교각명' && r[1] === '교각형식').length,
+        ip: findHeaders(grid, (r) => r[0] === '교각명' && r[1] === 'IP점').length,
+        bearing: findHeaders(grid, (r) => r[0] === '교각명' && r[1] === '받침번호').length,
+      },
+      piers: found.length,
+      issues: sheetIssues,
+      ok: found.length > 0 && !sheetIssues.some((i) => i.level === 'E'),
+    });
   }
-  return { piers, issues };
+  return { piers, issues, sheets };
 }
 
 function parseSheet(grid: Grid, sheet: string, issues: Issue[]): PierInput[] {
@@ -61,18 +87,19 @@ function parseSheet(grid: Grid, sheet: string, issues: Issue[]): PierInput[] {
           code: 'E03',
           level: 'E',
           pier: name,
-          message: `${sheet} ${bad.row}행: 방위각 문자열을 읽을 수 없습니다. 예: 75°56'55.9"`,
+          message: `${bad.row}행: 방위각을 읽을 수 없습니다. 예: 75°56'55.9" 형식으로 고치세요.`,
         });
         continue;
       }
       const type = String(cells[1]) as PierType;
       const foundation = String(cells[5]) as FoundationType;
       if (!PIER_TYPES.includes(type) || !FOUNDATION_TYPES.includes(foundation)) {
-        issues.push({ code: 'E01', level: 'E', pier: name, message: `${sheet} ${index + 1}행: 교각형식 또는 기초 형식을 알 수 없습니다.` });
+        issues.push({ code: 'E01', level: 'E', pier: name, message: `${index + 1}행: 교각형식 또는 기초 형식을 알 수 없습니다.` });
         continue;
       }
       piers.push({
         name,
+        sheet,
         type,
         copingTopEl: Number(cells[2]),
         footingBottomEl: Number(cells[3]),
diff --git a/src/core/types.ts b/src/core/types.ts
index 1b371fd..d935bf2 100644
--- a/src/core/types.ts
+++ b/src/core/types.ts
@@ -21,6 +21,8 @@ export interface Bearing {
 
 export interface PierInput {
   name: string;
+  /** Source sheet name in the workbook (1 sheet = 1 pier in the spec, several allowed). */
+  sheet: string;
   type: PierType;
   copingTopEl: number;
   footingBottomEl: number;
diff --git a/src/main.ts b/src/main.ts
index c1b96bf..d0470ce 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -2,7 +2,7 @@ import './style.css';
 import * as THREE from 'three';
 import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls.js';
 import * as XLSX from 'xlsx';
-import { parseWorkbook } from './core/parseWorkbook';
+import { parseWorkbook, type SheetReport } from './core/parseWorkbook';
 import { buildPier, type PierModel } from './core/geometry';
 import { NOT_IMPLEMENTED_RULES, validateInput, validatePier } from './core/validate';
 import type { Issue, PierInput } from './core/types';
@@ -16,17 +16,19 @@ interface Loaded {
 
 const $ = <T extends HTMLElement>(id: string): T => document.getElementById(id) as T;
 
-const VIEW_LABELS: Record<ViewKind, string> = { iso: '등각', front: '정면', side: '측면', top: '평면' };
+const VIEW_LABELS: Record<ViewKind, string> = { iso: '아이소', front: '정면', side: '측면', top: '평면' };
 
 const state: {
   piers: Loaded[];
   parseIssues: Issue[];
+  sheets: SheetReport[];
   current: { loaded: Loaded; scene: PierScene } | null;
   view: ViewKind;
   visible: Record<PartName, boolean>;
 } = {
   piers: [],
   parseIssues: [],
+  sheets: [],
   current: null,
   view: 'iso',
   visible: Object.fromEntries(Object.keys(PART_LABELS).map((k) => [k, true])) as Record<PartName, boolean>,
@@ -113,7 +115,7 @@ function setView(kind: ViewKind): void {
 
 // --- Loading ----------------------------------------------------------------------
 function loadWorkbookBytes(bytes: Uint8Array): void {
-  const { piers, issues: parseIssues } = parseWorkbook(XLSX.read(bytes, { type: 'array' }));
+  const { piers, issues: parseIssues, sheets } = parseWorkbook(XLSX.read(bytes, { type: 'array' }));
   const loaded: Loaded[] = piers.map((input) => {
     const issues: Issue[] = [];
     let model: PierModel | null = null;
@@ -129,17 +131,20 @@ function loadWorkbookBytes(bytes: Uint8Array): void {
   });
   state.piers = loaded;
   state.parseIssues = parseIssues;
+  state.sheets = sheets;
+  renderSheets();
 
+  // Only piers from sheets without E-level issues can be selected (spec §2.3).
+  const selectable = (l: Loaded) => !!l.model && sheets.find((s) => s.name === l.input.sheet)?.ok === true;
   const select = $<HTMLSelectElement>('pier');
   select.replaceChildren();
-  for (const item of loaded) {
-    if (!item.model) continue;
+  for (const item of loaded.filter(selectable)) {
     select.appendChild(new Option(item.input.name, item.input.name));
   }
   select.disabled = select.options.length === 0;
-  const built = loaded.filter((l) => l.model).length;
-  $('status').textContent = `교각 ${piers.length}기 인식, 형상 생성 ${built}기`;
-  const first = loaded.find((l) => l.model);
+  const built = loaded.filter(selectable).length;
+  $('status').textContent = `시트 ${sheets.length}장 · 교각 ${piers.length}기 인식 · 선택 가능 ${built}기`;
+  const first = loaded.find(selectable);
   if (first) showPier(first.input.name);
   else showPier(null);
 }
@@ -192,12 +197,15 @@ function renderResults(loaded: Loaded | null): void {
     row(body, '기둥 중심 (국토좌표 m)', pt(m.pivot));
     row(body, '코핑 상면 EL 기준 (m)', fmt(loaded.input.copingTopEl));
     row(body, '전열 구간 상면 EL (m)', m.segments.map((s) => fmt(s.top)).join(' / '));
+    row(body, '계단 경계 (BP1 기준, m)', m.segments.slice(1).map((s) => fmt(s.s0)).join(' / '));
+    row(body, '횡방향 단차', '없음');
     row(body, '코핑 끝단 하면 EL (m)', fmt(m.endBottom));
     row(body, '코핑 Level 하면 EL (m)', fmt(m.levelBottom));
     row(body, '기둥 높이 (m)', fmt(m.derived.columnHeight));
     row(body, '확대기초 상면 EL (m)', m.footings.length ? fmt(m.footings[0].top) : '없음');
     row(body, '흙덮개 (m)', fmt(m.derived.soilCover));
     row(body, '말뚝 수 (본)', String(m.derived.pileCount));
+    row(body, '말뚝 배치', m.derived.pileLayout ?? '없음');
     row(body, '말뚝 선단 EL (m)', m.derived.pileTipEl === null ? '없음' : fmt(m.derived.pileTipEl));
     row(body, '받침블럭 콘크리트 전열 / 후열 (mm)', `${Math.round(m.derived.blockHeightFront * 1000)} / ${Math.round(m.derived.blockHeightBack * 1000)}`);
   } else {
@@ -226,6 +234,28 @@ function renderResults(loaded: Loaded | null): void {
   for (const text of items) defaults.appendChild(el('li', text));
 }
 
+function renderSheets(): void {
+  const box = $<HTMLUListElement>('sheets');
+  box.replaceChildren();
+  if (state.sheets.length === 0) {
+    box.appendChild(el('li', '엑셀을 불러오면 시트별 인식 결과가 표시됩니다.'));
+    return;
+  }
+  for (const s of state.sheets) {
+    const li = el('li');
+    const status = s.ok ? '선택 가능' : '선택 불가 (오류)';
+    const head = el('span', `${s.name} · ${status}`, s.ok ? 'sheet-ok' : 'code');
+    const detail = document.createTextNode(` · 교각 ${s.tables.pier}표 · IP ${s.tables.ip}표 · 받침 ${s.tables.bearing}표`);
+    li.append(head, detail);
+    box.appendChild(li);
+    for (const issue of s.issues) {
+      const sub = el('li', `${issue.code} ${issue.pier ? `[${issue.pier}] ` : ''}${issue.message}`, issue.level === 'E' ? 'code' : undefined);
+      sub.style.marginLeft = '16px';
+      box.appendChild(sub);
+    }
+  }
+}
+
 // --- Events -----------------------------------------------------------------------
 $<HTMLButtonElement>('sample').addEventListener('click', async () => {
   $('status').textContent = '샘플 불러오는 중…';
@@ -252,6 +282,7 @@ $<HTMLSelectElement>('pier').addEventListener('change', (ev) => showPier((ev.tar
 
 buildPartToggles();
 buildViewButtons();
+renderSheets();
 renderResults(null);
 
 // Deep link for the bundled sample: open with ?sample=1 to load P1 without clicking.
diff --git a/src/style.css b/src/style.css
index bb20c0f..c194302 100644
--- a/src/style.css
+++ b/src/style.css
@@ -216,6 +216,11 @@ td:first-child {
   color: var(--warn);
 }
 
+.issues .sheet-ok {
+  font-weight: 600;
+  color: var(--primary);
+}
+
 @media (max-width: 900px) {
   .layout {
     grid-template-columns: 1fr;
diff --git a/tests/p1-regression.test.ts b/tests/p1-regression.test.ts
index aeb1986..3932fd1 100644
--- a/tests/p1-regression.test.ts
+++ b/tests/p1-regression.test.ts
@@ -100,3 +100,9 @@ describe('P1 regression — spec.md §12', () => {
     expect(f.top - f.bottom).toBeCloseTo(2.0, 4);
   });
 });
+
+describe('pile layout text (spec §12, §6.8 display)', () => {
+  it('reads 4@2250 × 3@2250 = 20본', () => {
+    expect(model.derived.pileLayout).toBe('4@2250 × 3@2250 = 20본');
+  });
+});
diff --git a/tests/parse.test.ts b/tests/parse.test.ts
index 691d607..dd08d1c 100644
--- a/tests/parse.test.ts
+++ b/tests/parse.test.ts
@@ -32,3 +32,20 @@ describe('parseWorkbook (P1 sheet intent.PR)', () => {
     expect(p1.bearings[0].azimuthDeg).toBeCloseTo(75.9489, 4);
   });
 });
+
+describe('sheet report (spec §2.3)', () => {
+  it('marks the P1 sheet as selectable and counts its tables', () => {
+    const { sheets } = parseWorkbook(loadWorkbook());
+    expect(sheets).toHaveLength(1);
+    expect(sheets[0]).toMatchObject({ name: 'intent.PR', ok: true, piers: 1, tables: { pier: 1, ip: 1, bearing: 1 } });
+  });
+
+  it('marks a sheet with a bad azimuth (E03) as not selectable and drops its pier', () => {
+    const wb = loadWorkbook();
+    wb.Sheets['intent.PR']['F32'].v = '75.9';
+    const { piers, sheets, issues } = parseWorkbook(wb);
+    expect(issues.map((i) => i.code)).toContain('E03');
+    expect(sheets[0].ok).toBe(false);
+    expect(piers).toHaveLength(0);
+  });
+});