The authors consider the linear delay differential system \[ \dot x(t)=Ax(t)+\sum_{i=1}^{r}A_{i}x(t-\tau_{i}) \tag{1} \] with the initial condition \[ x(t_0+\theta)=\Phi(\theta),\quad \theta\in[-\tau,0]\quad (\tau=\max_{i=1,2,\dots ,r}\tau_{i}), \tag{2} \] where \(A, A_{i}\), \(i=1,2,\dots ,r\), are real constant matrices \(A_{i}\neq 0\), \(\tau_{i}\), \(i=1,2,\dots ,r\), are constant delays. Sufficient delay-independent/delay-dependent conditions are given that guarantee the asymptotic stability of the linear system (1)–(2). A Lyapunov-Krasovskii functional approach combined with linear matrix inequality techniques is used in the proof. The references of the paper contain more than fifty titles of books and papers.