CWICR Productivity Tracker
Business Case
Problem Statement
Project performance tracking requires:
-
Comparing actual vs planned productivity
-
Identifying underperforming activities
-
Forecasting completion dates
-
Learning from historical data
Solution
Track productivity by comparing actual hours/quantities against CWICR norms, generating variance analysis and forecasts.
Business Value
-
Performance visibility - Real-time productivity metrics
-
Early warning - Identify issues before escalation
-
Continuous improvement - Learn from variances
-
Accurate forecasting - Data-driven predictions
Technical Implementation
import pandas as pd import numpy as np from typing import Dict, Any, List, Optional, Tuple from dataclasses import dataclass, field from datetime import datetime, timedelta from enum import Enum from collections import defaultdict
class PerformanceStatus(Enum): """Performance status categories.""" EXCELLENT = "excellent" # >110% productivity ON_TARGET = "on_target" # 90-110% BELOW_TARGET = "below_target" # 70-90% CRITICAL = "critical" # <70%
@dataclass class ProductivityRecord: """Single productivity record.""" work_item_code: str description: str date: datetime planned_hours: float actual_hours: float planned_quantity: float actual_quantity: float productivity_rate: float # Percentage status: PerformanceStatus variance_hours: float labor_cost_variance: float
@dataclass class ProductivitySummary: """Productivity summary for period/project.""" period_start: datetime period_end: datetime total_planned_hours: float total_actual_hours: float overall_productivity: float hours_variance: float cost_variance: float records: List[ProductivityRecord] by_status: Dict[str, int] by_category: Dict[str, float] trend: List[float] # Daily/weekly productivity trend
class CWICRProductivityTracker: """Track productivity against CWICR norms."""
def __init__(self, cwicr_data: pd.DataFrame,
labor_rate: float = 35.0):
self.work_items = cwicr_data
self.labor_rate = labor_rate
self._index_data()
def _index_data(self):
"""Index work items for fast lookup."""
if 'work_item_code' in self.work_items.columns:
self._work_index = self.work_items.set_index('work_item_code')
else:
self._work_index = None
def _get_status(self, productivity_rate: float) -> PerformanceStatus:
"""Determine performance status from productivity rate."""
if productivity_rate >= 110:
return PerformanceStatus.EXCELLENT
elif productivity_rate >= 90:
return PerformanceStatus.ON_TARGET
elif productivity_rate >= 70:
return PerformanceStatus.BELOW_TARGET
else:
return PerformanceStatus.CRITICAL
def calculate_productivity(self,
work_item_code: str,
actual_hours: float,
actual_quantity: float,
date: datetime = None) -> ProductivityRecord:
"""Calculate productivity for single work item."""
if date is None:
date = datetime.now()
if self._work_index is not None and work_item_code in self._work_index.index:
work_item = self._work_index.loc[work_item_code]
labor_norm = float(work_item.get('labor_norm', 0) or 0)
planned_hours = labor_norm * actual_quantity
# Productivity rate (planned/actual * 100)
productivity_rate = (planned_hours / actual_hours * 100) if actual_hours > 0 else 0
# Variances
hours_variance = planned_hours - actual_hours
cost_variance = hours_variance * self.labor_rate
return ProductivityRecord(
work_item_code=work_item_code,
description=str(work_item.get('description', '')),
date=date,
planned_hours=round(planned_hours, 2),
actual_hours=actual_hours,
planned_quantity=actual_quantity, # Using actual as target
actual_quantity=actual_quantity,
productivity_rate=round(productivity_rate, 1),
status=self._get_status(productivity_rate),
variance_hours=round(hours_variance, 2),
labor_cost_variance=round(cost_variance, 2)
)
else:
return ProductivityRecord(
work_item_code=work_item_code,
description="NOT FOUND",
date=date,
planned_hours=0,
actual_hours=actual_hours,
planned_quantity=actual_quantity,
actual_quantity=actual_quantity,
productivity_rate=0,
status=PerformanceStatus.CRITICAL,
variance_hours=0,
labor_cost_variance=0
)
def track_daily_production(self,
records: List[Dict[str, Any]]) -> ProductivitySummary:
"""Track daily production from multiple records."""
productivity_records = []
for record in records:
prod = self.calculate_productivity(
work_item_code=record.get('work_item_code', record.get('code')),
actual_hours=record.get('actual_hours', 0),
actual_quantity=record.get('actual_quantity', 0),
date=record.get('date', datetime.now())
)
productivity_records.append(prod)
# Aggregate
total_planned = sum(r.planned_hours for r in productivity_records)
total_actual = sum(r.actual_hours for r in productivity_records)
overall_productivity = (total_planned / total_actual * 100) if total_actual > 0 else 0
# By status
by_status = defaultdict(int)
for r in productivity_records:
by_status[r.status.value] += 1
# Get date range
dates = [r.date for r in productivity_records if r.date]
period_start = min(dates) if dates else datetime.now()
period_end = max(dates) if dates else datetime.now()
return ProductivitySummary(
period_start=period_start,
period_end=period_end,
total_planned_hours=round(total_planned, 2),
total_actual_hours=round(total_actual, 2),
overall_productivity=round(overall_productivity, 1),
hours_variance=round(total_planned - total_actual, 2),
cost_variance=round((total_planned - total_actual) * self.labor_rate, 2),
records=productivity_records,
by_status=dict(by_status),
by_category={},
trend=[]
)
def forecast_completion(self,
remaining_work: List[Dict[str, Any]],
current_productivity: float,
available_hours_per_day: float = 80) -> Dict[str, Any]:
"""Forecast completion based on current productivity."""
# Calculate remaining planned hours
total_planned = 0
for item in remaining_work:
code = item.get('work_item_code', item.get('code'))
qty = item.get('quantity', 0)
if self._work_index is not None and code in self._work_index.index:
work_item = self._work_index.loc[code]
labor_norm = float(work_item.get('labor_norm', 0) or 0)
total_planned += labor_norm * qty
# Adjust for productivity
if current_productivity > 0:
actual_hours_needed = total_planned / (current_productivity / 100)
else:
actual_hours_needed = total_planned
# Days to complete
days_to_complete = actual_hours_needed / available_hours_per_day if available_hours_per_day > 0 else 0
return {
'remaining_planned_hours': round(total_planned, 1),
'estimated_actual_hours': round(actual_hours_needed, 1),
'current_productivity': current_productivity,
'days_to_complete': int(np.ceil(days_to_complete)),
'forecasted_completion': datetime.now() + timedelta(days=int(np.ceil(days_to_complete))),
'productivity_impact': round(actual_hours_needed - total_planned, 1)
}
def analyze_variance(self,
summary: ProductivitySummary) -> Dict[str, Any]:
"""Analyze productivity variances in detail."""
# Get critical items
critical = [r for r in summary.records if r.status == PerformanceStatus.CRITICAL]
below_target = [r for r in summary.records if r.status == PerformanceStatus.BELOW_TARGET]
# Top impact items (by cost variance)
sorted_by_impact = sorted(summary.records, key=lambda x: x.labor_cost_variance)
top_negative = [r for r in sorted_by_impact[:5] if r.labor_cost_variance < 0]
top_positive = [r for r in sorted_by_impact[-5:] if r.labor_cost_variance > 0]
return {
'overall_productivity': summary.overall_productivity,
'total_hours_variance': summary.hours_variance,
'total_cost_variance': summary.cost_variance,
'critical_items_count': len(critical),
'below_target_count': len(below_target),
'critical_items': [
{'code': r.work_item_code, 'productivity': r.productivity_rate, 'variance': r.labor_cost_variance}
for r in critical
],
'top_negative_impact': [
{'code': r.work_item_code, 'variance': r.labor_cost_variance}
for r in top_negative
],
'top_positive_impact': [
{'code': r.work_item_code, 'variance': r.labor_cost_variance}
for r in top_positive
],
'recommendations': self._generate_recommendations(critical, below_target)
}
def _generate_recommendations(self,
critical: List[ProductivityRecord],
below_target: List[ProductivityRecord]) -> List[str]:
"""Generate improvement recommendations."""
recommendations = []
if len(critical) > 0:
recommendations.append(
f"Immediate attention needed for {len(critical)} critical items"
)
if len(below_target) > 3:
recommendations.append(
"Consider crew training or method review for underperforming activities"
)
# Check for patterns
critical_codes = [r.work_item_code for r in critical]
if any('CONC' in code for code in critical_codes):
recommendations.append("Review concrete work methods and crew composition")
if any('EXCV' in code for code in critical_codes):
recommendations.append("Check equipment availability and operator skills for excavation")
return recommendations
def export_report(self,
summary: ProductivitySummary,
output_path: str) -> str:
"""Export productivity report to Excel."""
with pd.ExcelWriter(output_path, engine='openpyxl') as writer:
# Details
details_df = pd.DataFrame([
{
'Work Item': r.work_item_code,
'Description': r.description,
'Date': r.date.strftime('%Y-%m-%d'),
'Planned Hours': r.planned_hours,
'Actual Hours': r.actual_hours,
'Productivity %': r.productivity_rate,
'Status': r.status.value,
'Hours Variance': r.variance_hours,
'Cost Variance': r.labor_cost_variance
}
for r in summary.records
])
details_df.to_excel(writer, sheet_name='Details', index=False)
# Summary
summary_df = pd.DataFrame([{
'Period Start': summary.period_start.strftime('%Y-%m-%d'),
'Period End': summary.period_end.strftime('%Y-%m-%d'),
'Total Planned Hours': summary.total_planned_hours,
'Total Actual Hours': summary.total_actual_hours,
'Overall Productivity %': summary.overall_productivity,
'Hours Variance': summary.hours_variance,
'Cost Variance': summary.cost_variance
}])
summary_df.to_excel(writer, sheet_name='Summary', index=False)
# By Status
status_df = pd.DataFrame([
{'Status': status, 'Count': count}
for status, count in summary.by_status.items()
])
status_df.to_excel(writer, sheet_name='By Status', index=False)
return output_path
class ProductivityDashboard: """Generate productivity dashboard data."""
def __init__(self, tracker: CWICRProductivityTracker):
self.tracker = tracker
def get_kpis(self, summary: ProductivitySummary) -> Dict[str, Any]:
"""Get key performance indicators."""
return {
'overall_productivity': summary.overall_productivity,
'productivity_status': 'Good' if summary.overall_productivity >= 90 else 'Needs Attention',
'hours_saved': max(0, summary.hours_variance),
'hours_over': abs(min(0, summary.hours_variance)),
'cost_impact': summary.cost_variance,
'items_on_target': summary.by_status.get('on_target', 0) + summary.by_status.get('excellent', 0),
'items_below_target': summary.by_status.get('below_target', 0) + summary.by_status.get('critical', 0)
}
def get_trend_data(self,
historical_summaries: List[ProductivitySummary]) -> pd.DataFrame:
"""Get productivity trend data for charting."""
data = []
for s in historical_summaries:
data.append({
'date': s.period_end.strftime('%Y-%m-%d'),
'productivity': s.overall_productivity,
'planned_hours': s.total_planned_hours,
'actual_hours': s.total_actual_hours
})
return pd.DataFrame(data)
Quick Start
Load CWICR data
cwicr = pd.read_parquet("ddc_cwicr_en.parquet")
Initialize tracker
tracker = CWICRProductivityTracker(cwicr, labor_rate=35.0)
Track daily production
records = [ {'work_item_code': 'CONC-001', 'actual_hours': 45, 'actual_quantity': 50}, {'work_item_code': 'REBAR-002', 'actual_hours': 32, 'actual_quantity': 2000}, {'work_item_code': 'EXCV-003', 'actual_hours': 28, 'actual_quantity': 100} ]
summary = tracker.track_daily_production(records)
print(f"Overall Productivity: {summary.overall_productivity}%") print(f"Hours Variance: {summary.hours_variance}") print(f"Cost Variance: ${summary.cost_variance:,.2f}")
Common Use Cases
- Variance Analysis
analysis = tracker.analyze_variance(summary) for rec in analysis['recommendations']: print(rec)
- Completion Forecast
remaining = [ {'work_item_code': 'CONC-001', 'quantity': 100}, {'work_item_code': 'REBAR-002', 'quantity': 5000} ] forecast = tracker.forecast_completion(remaining, current_productivity=85.0) print(f"Days to Complete: {forecast['days_to_complete']}")
- Export Report
tracker.export_report(summary, "productivity_report.xlsx")
Resources
-
GitHub: OpenConstructionEstimate-DDC-CWICR
-
DDC Book: Chapter 3.1 - Productivity Management