The chapter discusses the determination of supersymmetric parameters at the Large Hadron Collider (LHC) and the International Linear Collider (ILC), highlighting both favorable and challenging scenarios. Supersymmetry, a theory that pairs each fermionic degree of freedom with a bosonic counterpart, predicts a light Higgs boson and provides a link between collider physics and cosmology. The particle spectrum includes neutral and charged Higgs bosons, sleptons, squarks, neutralinos, charginos, and the gluino. The origin of supersymmetry breaking is not fully understood, with models like the Minimal Supersymmetric Standard Model (MSSM), Minimal Supergravity (mSUGRA), and Decoupled Scalars Supersymmetry (DSS) being used to parametrize this ignorance. The chapter details the experimental signatures for detecting supersymmetry, such as missing transverse energy, and the challenges in determining the underlying parameters from experimental data. Advanced tools like Fittino and SFitter are used to sample multi-dimensional parameter spaces, and Markov chains are employed to identify the correct parameter set, which often involves secondary minima. The precision of measurements at the LHC and ILC is discussed, with the inclusion of theory errors affecting both LHC and ILC precision. The chapter also explores the NMSSM and eNMSSM models, which introduce additional particles and parameters to explain the $\mu$ term and unify breaking parameters. The production of sgluons, a type of R = +1 scalar particle, is highlighted as a potentially significant discovery at the LHC. Finally, the chapter concludes by emphasizing the continued attractiveness of supersymmetry as a candidate for new physics at the TeV scale and the potential for the LHC to provide precise measurements of dark matter properties.The chapter discusses the determination of supersymmetric parameters at the Large Hadron Collider (LHC) and the International Linear Collider (ILC), highlighting both favorable and challenging scenarios. Supersymmetry, a theory that pairs each fermionic degree of freedom with a bosonic counterpart, predicts a light Higgs boson and provides a link between collider physics and cosmology. The particle spectrum includes neutral and charged Higgs bosons, sleptons, squarks, neutralinos, charginos, and the gluino. The origin of supersymmetry breaking is not fully understood, with models like the Minimal Supersymmetric Standard Model (MSSM), Minimal Supergravity (mSUGRA), and Decoupled Scalars Supersymmetry (DSS) being used to parametrize this ignorance. The chapter details the experimental signatures for detecting supersymmetry, such as missing transverse energy, and the challenges in determining the underlying parameters from experimental data. Advanced tools like Fittino and SFitter are used to sample multi-dimensional parameter spaces, and Markov chains are employed to identify the correct parameter set, which often involves secondary minima. The precision of measurements at the LHC and ILC is discussed, with the inclusion of theory errors affecting both LHC and ILC precision. The chapter also explores the NMSSM and eNMSSM models, which introduce additional particles and parameters to explain the $\mu$ term and unify breaking parameters. The production of sgluons, a type of R = +1 scalar particle, is highlighted as a potentially significant discovery at the LHC. Finally, the chapter concludes by emphasizing the continued attractiveness of supersymmetry as a candidate for new physics at the TeV scale and the potential for the LHC to provide precise measurements of dark matter properties.