Space Mission Analysis and Design is the standard methodology for mission engineering. The textbook series defines the process: mission definition, orbit selection, spacecraft sizing, subsystem design, operations planning. It provides the equations, the reference values, and the design flow.
What it does not provide is the tool. Practicing SMAD methodology today means using a collection of disconnected tools. Requirements in DOORS or a spreadsheet. Orbit analysis in STK or MATLAB scripts. Mass and power budgets in Excel. Risk register in another spreadsheet. Phase gate tracking in PowerPoint.
The methodology connects these domains. A requirement drives a mass allocation. A mass allocation affects the power budget. A power budget constraint influences orbit selection. The textbook explains these connections. But the tools do not maintain them.
SMAD Portal is the tool the methodology always needed. Requirements link to budgets. Budgets link to calculators. Calculators use SMAD reference equations. Phase gates track readiness across all domains. When a mass allocation changes, the connected requirements, power budget, and phase gate status all update together.